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Task/Statistics-Basic/J/statistics-basic-3.j

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+histogram=: <: @ (#/.~) @ (i.@#@[ , I.)
+
+meanstddevP=:3 :0
+  NB. compute mean and std dev of y random numbers
+  NB. picked from even distribution between 0 and 1
+  NB. and display a normalized ascii histogram for this sample
+  NB. note: should use population mean, not sample mean, for stddev
+  NB.       given the equation specified for this task.
+  h=.s=.t=. 0
+  buckets=. (%~1+i.)10
+  for_n.i.<.y%1e6 do.
+    data=. ?1e6#0
+    h=.h+ buckets histogram data
+    s=.s+ +/ data
+    t=.t+ +/(data-0.5)^2
+  end.
+  data=. ?(1e6|y)#0
+  h=.h+ buckets histogram data
+  s=.s+ +/ data
+  t=.t++/(data-0.5)^2
+  smoutput (<.300*h%y)#"0'#'
+  (s%y),%:t%y
+)