diff --git a/packages/squiggle-lang/src/js/index.ts b/packages/squiggle-lang/src/js/index.ts
index 4b8cddab..4ffeb972 100644
--- a/packages/squiggle-lang/src/js/index.ts
+++ b/packages/squiggle-lang/src/js/index.ts
@@ -28,6 +28,7 @@ import {
   Constructors_cdf,
   Constructors_inv,
   Constructors_normalize,
+  Constructors_isNormalized,
   Constructors_toPointSet,
   Constructors_toSampleSet,
   Constructors_truncate,
@@ -189,6 +190,10 @@ export class Distribution {
     return Constructors_inv({ env: this.env }, this.t, n);
   }
 
+  isNormalized(): result<boolean, distributionError> {
+    return Constructors_isNormalized({ env: this.env }, this.t);
+  }
+
   normalize(): result<Distribution, distributionError> {
     return this.mapResultDist(
       Constructors_normalize({ env: this.env }, this.t)
diff --git a/packages/squiggle-lang/src/rescript/Distributions/DistributionOperation/DistributionOperation.res b/packages/squiggle-lang/src/rescript/Distributions/DistributionOperation/DistributionOperation.res
index 7ae78e08..a2196f4c 100644
--- a/packages/squiggle-lang/src/rescript/Distributions/DistributionOperation/DistributionOperation.res
+++ b/packages/squiggle-lang/src/rescript/Distributions/DistributionOperation/DistributionOperation.res
@@ -13,6 +13,7 @@ type outputType =
   | Dist(genericDist)
   | Float(float)
   | String(string)
+  | Bool(bool)
   | GenDistError(error)
 
 /*
@@ -66,6 +67,18 @@ module OutputLocal = {
     | e => Error(toErrorOrUnreachable(e))
     }
 
+  let toBool = (t: t) =>
+    switch t {
+    | Bool(d) => Some(d)
+    | _ => None
+    }
+
+  let toBoolR = (t: t): result<bool, error> =>
+    switch t {
+    | Bool(r) => Ok(r)
+    | e => Error(toErrorOrUnreachable(e))
+    }
+
   //This is used to catch errors in other switch statements.
   let fromResult = (r: result<t, error>): outputType =>
     switch r {
@@ -107,8 +120,8 @@ let rec run = (~env, functionCallInfo: functionCallInfo): outputType => {
       (),
     )->OutputLocal.toDistR
 
-  let fromDistFn = (subFnName: GenericDist_Types.Operation.fromDist, dist: genericDist) =>
-    switch subFnName {
+  let fromDistFn = (subFnName: GenericDist_Types.Operation.fromDist, dist: genericDist) =>{
+    let response = switch subFnName {
     | ToFloat(distToFloatOperation) =>
       GenericDist.toFloatOperation(dist, ~toPointSetFn, ~distToFloatOperation)
       ->E.R2.fmap(r => Float(r))
@@ -123,6 +136,7 @@ let rec run = (~env, functionCallInfo: functionCallInfo): outputType => {
         Dist(dist)
       }
     | ToDist(Normalize) => dist->GenericDist.normalize->Dist
+    | ToBool(IsNormalized) => dist->GenericDist.isNormalized->Bool
     | ToDist(Truncate(leftCutoff, rightCutoff)) =>
       GenericDist.truncate(~toPointSetFn, ~leftCutoff, ~rightCutoff, dist, ())
       ->E.R2.fmap(r => Dist(r))
@@ -154,6 +168,8 @@ let rec run = (~env, functionCallInfo: functionCallInfo): outputType => {
       ->E.R2.fmap(r => Dist(r))
       ->OutputLocal.fromResult
     }
+    response
+  }
 
   switch functionCallInfo {
   | FromDist(subFnName, dist) => fromDistFn(subFnName, dist)
@@ -201,6 +217,7 @@ module Constructors = {
   let inv = (~env, dist, f) => C.inv(dist, f)->run(~env)->toFloatR
   let pdf = (~env, dist, f) => C.pdf(dist, f)->run(~env)->toFloatR
   let normalize = (~env, dist) => C.normalize(dist)->run(~env)->toDistR
+  let isNormalized = (~env, dist) => C.isNormalized(dist)->run(~env)->toBoolR
   let toPointSet = (~env, dist) => C.toPointSet(dist)->run(~env)->toDistR
   let toSampleSet = (~env, dist, n) => C.toSampleSet(dist, n)->run(~env)->toDistR
   let truncate = (~env, dist, leftCutoff, rightCutoff) =>
diff --git a/packages/squiggle-lang/src/rescript/Distributions/DistributionOperation/DistributionOperation.resi b/packages/squiggle-lang/src/rescript/Distributions/DistributionOperation/DistributionOperation.resi
index e4f7759f..9b21a04e 100644
--- a/packages/squiggle-lang/src/rescript/Distributions/DistributionOperation/DistributionOperation.resi
+++ b/packages/squiggle-lang/src/rescript/Distributions/DistributionOperation/DistributionOperation.resi
@@ -11,6 +11,7 @@ type outputType =
   | Dist(genericDist)
   | Float(float)
   | String(string)
+  | Bool(bool)
   | GenDistError(error)
 
 @genType
@@ -34,6 +35,8 @@ module Output: {
   let toFloatR: t => result<float, error>
   let toString: t => option<string>
   let toStringR: t => result<string, error>
+  let toBool: t => option<bool>
+  let toBoolR: t => result<bool, error>
   let toError: t => option<error>
   let fmap: (~env: env, t, GenericDist_Types.Operation.singleParamaterFunction) => t
 }
@@ -52,6 +55,8 @@ module Constructors: {
   @genType
   let normalize: (~env: env, genericDist) => result<genericDist, error>
   @genType
+  let isNormalized: (~env: env, genericDist) => result<bool, error>
+  @genType
   let toPointSet: (~env: env, genericDist) => result<genericDist, error>
   @genType
   let toSampleSet: (~env: env, genericDist, int) => result<genericDist, error>
diff --git a/packages/squiggle-lang/src/rescript/Distributions/GenericDist/GenericDist.res b/packages/squiggle-lang/src/rescript/Distributions/GenericDist/GenericDist.res
index 1f8739c4..1fe0293f 100644
--- a/packages/squiggle-lang/src/rescript/Distributions/GenericDist/GenericDist.res
+++ b/packages/squiggle-lang/src/rescript/Distributions/GenericDist/GenericDist.res
@@ -32,6 +32,15 @@ let normalize = (t: t): t =>
   | SampleSet(_) => t
   }
 
+let integralEndY = (t: t): float =>
+  switch t {
+  | PointSet(r) => PointSetDist.T.integralEndY(r)
+  | Symbolic(_) => 1.0
+  | SampleSet(_) => 1.0
+  }
+
+let isNormalized = (t: t): bool => integralEndY(t) == 1.0
+
 let toFloatOperation = (
   t,
   ~toPointSetFn: toPointSetFn,
diff --git a/packages/squiggle-lang/src/rescript/Distributions/GenericDist/GenericDist.resi b/packages/squiggle-lang/src/rescript/Distributions/GenericDist/GenericDist.resi
index bd6755fd..c49d18b5 100644
--- a/packages/squiggle-lang/src/rescript/Distributions/GenericDist/GenericDist.resi
+++ b/packages/squiggle-lang/src/rescript/Distributions/GenericDist/GenericDist.resi
@@ -15,6 +15,8 @@ let toString: t => string
 
 let normalize: t => t
 
+let isNormalized: t => bool
+
 let toFloatOperation: (
   t,
   ~toPointSetFn: toPointSetFn,
diff --git a/packages/squiggle-lang/src/rescript/Distributions/GenericDist/GenericDist_Types.res b/packages/squiggle-lang/src/rescript/Distributions/GenericDist/GenericDist_Types.res
index a0ddc911..b045a6d5 100644
--- a/packages/squiggle-lang/src/rescript/Distributions/GenericDist/GenericDist_Types.res
+++ b/packages/squiggle-lang/src/rescript/Distributions/GenericDist/GenericDist_Types.res
@@ -71,11 +71,14 @@ module Operation = {
     | ToString
     | ToSparkline(int)
 
+  type toBool = IsNormalized
+
   type fromDist =
     | ToFloat(toFloat)
     | ToDist(toDist)
     | ToDistCombination(direction, arithmeticOperation, [#Dist(genericDist) | #Float(float)])
     | ToString(toString)
+    | ToBool(toBool)
 
   type singleParamaterFunction =
     | FromDist(fromDist)
@@ -101,6 +104,7 @@ module Operation = {
     | ToDist(Inspect) => `inspect`
     | ToString(ToString) => `toString`
     | ToString(ToSparkline(n)) => `toSparkline(${E.I.toString(n)})`
+    | ToBool(IsNormalized) => `isNormalized`
     | ToDistCombination(Algebraic, _, _) => `algebraic`
     | ToDistCombination(Pointwise, _, _) => `pointwise`
     }
@@ -131,6 +135,7 @@ module Constructors = {
     let inv = (dist, x): t => FromDist(ToFloat(#Inv(x)), dist)
     let pdf = (dist, x): t => FromDist(ToFloat(#Pdf(x)), dist)
     let normalize = (dist): t => FromDist(ToDist(Normalize), dist)
+    let isNormalized = (dist): t => FromDist(ToBool(IsNormalized), dist)
     let toPointSet = (dist): t => FromDist(ToDist(ToPointSet), dist)
     let toSampleSet = (dist, r): t => FromDist(ToDist(ToSampleSet(r)), dist)
     let truncate = (dist, left, right): t => FromDist(ToDist(Truncate(left, right)), dist)
diff --git a/packages/squiggle-lang/src/rescript/Distributions/PointSetDist/Distributions.res b/packages/squiggle-lang/src/rescript/Distributions/PointSetDist/Distributions.res
index 28c8104b..0821611c 100644
--- a/packages/squiggle-lang/src/rescript/Distributions/PointSetDist/Distributions.res
+++ b/packages/squiggle-lang/src/rescript/Distributions/PointSetDist/Distributions.res
@@ -47,6 +47,7 @@ module Dist = (T: dist) => {
   let truncate = T.truncate
   let mean = T.mean
   let variance = T.variance
+  let integralEndY = T.integralEndY
 
   let updateIntegralCache = T.updateIntegralCache
 
diff --git a/packages/squiggle-lang/src/rescript/Distributions/SampleSetDist/SampleSetDist.res b/packages/squiggle-lang/src/rescript/Distributions/SampleSetDist/SampleSetDist.res
index fcd4055d..6b2fbc9f 100644
--- a/packages/squiggle-lang/src/rescript/Distributions/SampleSetDist/SampleSetDist.res
+++ b/packages/squiggle-lang/src/rescript/Distributions/SampleSetDist/SampleSetDist.res
@@ -12,12 +12,14 @@ module T: {
   let get: t => array<float>
 } = {
   type t = array<float>
-  let make = (a: array<float>) =>
+  let make = (a: array<float>) =>{
+    Js.log2("makingFromArray", a);
     if E.A.length(a) > 5 {
       Ok(a)
     } else {
       Error("too small")
     }
+  }
   let get = (a: t) => a
 }
 
diff --git a/packages/squiggle-lang/src/rescript/ReducerInterface/ReducerInterface_GenericDistribution.res b/packages/squiggle-lang/src/rescript/ReducerInterface/ReducerInterface_GenericDistribution.res
index b0ce84e3..3118c8b0 100644
--- a/packages/squiggle-lang/src/rescript/ReducerInterface/ReducerInterface_GenericDistribution.res
+++ b/packages/squiggle-lang/src/rescript/ReducerInterface/ReducerInterface_GenericDistribution.res
@@ -1,9 +1,11 @@
 module ExpressionValue = ReducerInterface_ExpressionValue
 type expressionValue = ReducerInterface_ExpressionValue.expressionValue
 
+let defaultSampleCount = 10000
+
 let runGenericOperation = DistributionOperation.run(
   ~env={
-    sampleCount: 1000,
+    sampleCount: defaultSampleCount,
     xyPointLength: 1000,
   },
 )
@@ -52,6 +54,13 @@ module Helpers = {
     FromDist(GenericDist_Types.Operation.ToString(fnCall), dist)->runGenericOperation->Some
   }
 
+  let toBoolFn = (
+    fnCall: GenericDist_Types.Operation.toBool,
+    dist: GenericDist_Types.genericDist,
+  ) => {
+    FromDist(GenericDist_Types.Operation.ToBool(fnCall), dist)->runGenericOperation->Some
+  }
+
   let toDistFn = (fnCall: GenericDist_Types.Operation.toDist, dist) => {
     FromDist(GenericDist_Types.Operation.ToDist(fnCall), dist)->runGenericOperation->Some
   }
@@ -193,12 +202,17 @@ let dispatchToGenericOutput = (call: ExpressionValue.functionCall): option<
     // https://mathjs.org/docs/reference/functions/exp.html
     Helpers.twoDiststoDistFn(Algebraic, "pow", GenericDist.fromFloat(Math.e), a)->Some
   | ("normalize", [EvDistribution(dist)]) => Helpers.toDistFn(Normalize, dist)
+  | ("isNormalized", [EvDistribution(dist)]) => Helpers.toBoolFn(IsNormalized, dist)
   | ("toPointSet", [EvDistribution(dist)]) => Helpers.toDistFn(ToPointSet, dist)
   | ("cdf", [EvDistribution(dist), EvNumber(float)]) => Helpers.toFloatFn(#Cdf(float), dist)
   | ("pdf", [EvDistribution(dist), EvNumber(float)]) => Helpers.toFloatFn(#Pdf(float), dist)
   | ("inv", [EvDistribution(dist), EvNumber(float)]) => Helpers.toFloatFn(#Inv(float), dist)
   | ("toSampleSet", [EvDistribution(dist), EvNumber(float)]) =>
     Helpers.toDistFn(ToSampleSet(Belt.Int.fromFloat(float)), dist)
+  | ("toSampleSet", [EvDistribution(dist)]) =>
+    Helpers.toDistFn(ToSampleSet(defaultSampleCount), dist)
+  | ("inspect", [EvDistribution(dist)]) =>
+    Helpers.toDistFn(Inspect, dist)
   | ("truncateLeft", [EvDistribution(dist), EvNumber(float)]) =>
     Helpers.toDistFn(Truncate(Some(float), None), dist)
   | ("truncateRight", [EvDistribution(dist), EvNumber(float)]) =>
@@ -244,6 +258,7 @@ let genericOutputToReducerValue = (o: DistributionOperation.outputType): result<
   | Dist(d) => Ok(ReducerInterface_ExpressionValue.EvDistribution(d))
   | Float(d) => Ok(EvNumber(d))
   | String(d) => Ok(EvString(d))
+  | Bool(d) => Ok(EvBool(d))
   | GenDistError(NotYetImplemented) => Error(RETodo("Function not yet implemented"))
   | GenDistError(Unreachable) => Error(RETodo("Unreachable"))
   | GenDistError(DistributionVerticalShiftIsInvalid) =>