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def mean(array)
array.inject(0) { |sum, x| sum += x } / array.size.to_f
end
def mean_and_standard_deviation(array)
m = mean(array)
variance = array.inject(0) { |variance, x| variance += (x - m) ** 2 }
return m, Math.sqrt(variance/(array.size-1))
end
puts mean_and_standard_deviation([1,2,3,1,1,2,1])
puts mean_and_standard_deviation([1,2,3,1,1,2,1000])
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