Answer:
Unusual
Step-by-step explanation:
we know that
The z-score is a measure of how close the given data point is to the mean of the values given with the standard deviation
so
if its z-score is greater than or equal to -2, or less than or equal to 2., then the data value is considered ordinary
if its z-score is less than -2 or greater than 2, then the data value is considered unusual
the answer is -2 because 21-23 is a negative number
1/40 = .025, just multiply this by 21 and you have your answer
.525
Answer:

Step-by-step explanation:
we know that

In this problem we have

substitute the given value in the formula and solve for F




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