# 6.2.jl
# 2020-11-23
# $Id: 6.2.jl 1.1 2020/11/23 00:00:00 s Exp $

using Dates, Printf

# ex   : E(x)
# varx : var(x)

# input
n = 6
x = [i * j for i = 1:n for j = 1:n] # comprehension

# calculating
m    = length(x)
ex   = sum(x) / m
varx = sum(x -> (x - ex) ^ 2, x) / m

# output
println(today())
println("6.2.jl")
print("x=")
foreach(x -> @printf(" %i", x), x)
println()
println("m= ", m)
println("E(x)= ", ex)
println("var(x)= ", round(varx; digits = 2))
# eof