Question 1136579
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{{{z = (x-mu)/(sigma/sqrt(n))}}}


{{{z = (84-80)/(20/sqrt(4))}}}


{{{z = (84-80)/(20/2)}}}


{{{z = (84-80)/(10)}}}


{{{z = 4/10}}}


{{{z = 0.40}}}


This z score is not larger than z = 3, so it is not atypical (aka unusual) to have a sample of 4 scores lead to a sample mean of 84
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