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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 less than 76 bpm
b. if 25 adult females are randomly selected, find the probability that they have pulse rates with a mean less than 76 bpm.
c. why can the normal distribution be used in part b, even though the sample size does not rxceed 30?
Math   Statistics-And-Probability   
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