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One college class had a total of 75 students. The average score for the class on the last exam was 86.8 with a standard deviation of 4.5. A random sample of 32 students was selected.
a. Calculate the standard error of the mean.
b. What is the probability that the sample mean will be less than 88??
c. What is the probability that the sample mean will be more than 87??
d. What is the probability that the sample mean will be between 85.5 and 87.5?
a. The standard error of the mean is
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