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alexus hollie 03/25/247:11 PM
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Question 14 of 16
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a. If 1 adult female is randomly selected, find the probability that her pulse rate is less than 81 beats per minute.
The probability is
(Round to four decimal places as needed.)
b. If 25 aduit females are randomly selected, find the probability that they have pulse rates with a mean less than 81 beats per minule.
The probablity is
(Round to four decimal places as needed.)
c. Why can the normal distribution be used in part (b), even though the sample size does notaxceed 30 ?
A. Since the original population has a normal distribution, the distribution of sample means is a normal distribution for ary sample size:
B. Since the distribution is of sample means, not individuals, the distribution is a normal distribution for any sample size
C. Since the mean pulse rate exceeds 30 , the distribution of sample means is a oormal distribution for any sample size.
D. Since the distribution is of individuals, not sample means, the distribution is a nomat dstrition for amy sample size.
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