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What is the mean of all three-digit positive integers whose digits are in the set {2,0,1,9}?

 May 3, 2020
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Sum =(102, 109, 120, 129, 190, 192, 201, 209, 210, 219, 290, 291, 901, 902, 910, 912, 920, 921) =7728

 

There are 18 integers. So, the mean =7728 / 18 =429 1/3 - the mean.

 May 3, 2020
edited by Guest  May 3, 2020

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