What is the probability that the mean of a group of 20 randomly chosen values (from 1 to 100) would be over 60? [Again, when you group means together, it shrinks the SD down. In this case, these would then have an SD of 29.01/sqrt (20) = 6.49]
Added by Michael P.
Step 1
We are given that the standard deviation (SD) of the means of these groups is 6.49, which is calculated by dividing the SD of the original distribution (29.01) by the square root of the sample size (20). Show more…
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