If 1 adult female is randomly selected, find the probability that her pulse rate is less than 80 beats per minute. The probability is 0.71230.7123. (Round to four decimal places as needed.) Part 2 b. If 4 adult females are randomly selected, find the probability that they have pulse rates with a mean less than 80 beats per minute.
If 1 adult female is randomly selected, find the probability that her pulse rate is less than 80 beats per minute. The probability is 0.71230.7123. (Round to four decimal places as needed.) Part 2 b. If 4 adult females are randomly selected, find the probability that they have pulse rates with a mean less than 80 beats per minute.
Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
18th Edition
ISBN:9780079039897
Author:Carter
Publisher:Carter
Chapter10: Statistics
Section10.4: Distributions Of Data
Problem 22PFA
Related questions
Question
Assume that females have pulse rates that are normally distributed with a mean of
μ=73.0
beats per minute and a standard deviation of
σ=12.5
beats per minute. Complete parts (a) through (c) below.Question content area bottom
Part 1
a. If 1 adult female is randomly selected, find the probability that her pulse rate is less than
80
beats per minute.The probability is
0.71230.7123.
(Round to four decimal places as needed.)
Part 2
b. If
4
adult females are randomly selected, find the probability that they have pulse rates with a mean less than
80
beats per minute.The probability is
0.86860.8686.
(Round to four decimal places as needed.)
Part 3
c. Why can the normal distribution be used in part (b), even though the sample size does not exceed 30?
Since the distribution is of sample means, not individuals, the distribution is a normal distribution for any sample size.
Since the distribution is of individuals, not sample means, the distribution is a normal distribution for any sample size.
Since the mean pulse rate exceeds 30, the distribution of sample means is a normal distribution for any sample size.
Since the original population has a normal distribution, the distribution of sample means is a normal distribution for any sample size.
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