hist1 with expected mean = 5
entries = 1000, mean = 4.98577, stddev = 1.98663
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hist2 with expected mean = 13
entries = 1500, mean = 12.9495, stddev = 4.00479
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hist3 with expected entries = 2500
entries = 2500, mean = 9.76403, stddev = 5.14032
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