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Assume that females have pulse rates that are normally distributed with a mean of 73.0 beats...

Assume that females have pulse rates that are normally distributed with a mean of 73.0 beats per minute and a standard deviation of 12.5 beats per minute.
a. If 1 adult female is randomly selected, find the probability that her pulse rate is between 66 beats per minute and 80 beats per minute.
The probability is?
b. If 4 adult females are randomly selected, find the probability that they have pulse rates with a mean between 66 beats per minute and 80 beats per minute.
c. Why can the normal distribution be used in part (b), even though the sample size does not exceed 30?
math   Statistics-And-Probability   
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