I have used a random number generator to find the probability rolling a size within one roll. now i have to find the mean and sd of that

I think you meant rolling a DIE, not size. It is probably a 6-sided die, right?

To find the mean, just add up all the numbers and dived by 6

1+2+3+4+5+6 / 6 = 3.5

Using the standard deviation formula, we get

sd = 1.7

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