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The final exam grade of a mathematics class has a skewed distribution with mean of 78...

The final exam grade of a mathematics class has a skewed distribution with mean of 78 and standard deviation of 7.2. If a random sample of 38 students selected from this class, then what is the probability that the average final exam grade of this sample is between 75 and 80? Answer: (keep 4 decimal places)

Math   Statistics-And-Probability   
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Answer #1

Refer Z-table to find the probability or use excel formula "=NORM.S.DIST(1.71, TRUE)" & "=NORM.S.DIST(-2.57, TRUE)" to find the probability.

The probability that the average final exam grade of this sample is between 75 and 80 is

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