Mathematics, 15.07.2021 23:20 KAMOO3X

Random samples of size 81 are taken from a population whose mean is 45 and standard deviation is 9. Calculate the probability that a sample mean is less than 42. (round to 4 decimal places) HINT: When you randomly select a group (n > 1) then you need to re-calculate the standard deviation using the formula:
σ n

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