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Unusual/Unlikely Eventsa. The mean pulse rate for adult

Elementary Statistics | 12th Edition | ISBN: 9780321836960 | Authors: Mario F. Triola ISBN: 9780321836960 18

Solution for problem 2CRE Chapter 4.8

Elementary Statistics | 12th Edition

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Elementary Statistics | 12th Edition | ISBN: 9780321836960 | Authors: Mario F. Triola

Elementary Statistics | 12th Edition

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Problem 2CRE

Problem 2CRE

 

Unusual/Unlikely Events

a. The mean pulse rate for adult women is 77.5 beats per minute, with a standard deviation of 11.6 beats per minute (based on Data Set 1 in Appendix B). Using the range rule of thumb, would a pulse rate of 100 beats per minute be considered unusual? Explain.

b. For the pulse rates of adult women described in part (a), is a pulse rate of 50 beats per minute unusual? Explain.

c. For a couple having eight children, is it unlikely to have all girls? Explain.

d. For a couple having three children, is it unlikely to have all girls? Explain.

Step-by-Step Solution:
Step 1 of 3

Solution 2CRE

a)

= 1.94

That is a pulse rate of 100 per minute is within 2 standard deviations from the mean, by the rage rule of thumb a pulse rate of 100 per minute is not unusual

b)

= -2.37

That is a pulse rate of 50 per minute is not within 2 standard deviations from the mean, by the rage rule of thumb a pulse rate of 50 per minute is unusual.

c)

= 0.00391

This probability is very low so it is unlikely for the couple to have all girls out of 8 children.

d)

= 0.125

This probability is not very low so it is not unlikely for the couple to have all girls out of 3 children.

Step 2 of 3

Chapter 4.8, Problem 2CRE is Solved
Step 3 of 3

Textbook: Elementary Statistics
Edition: 12
Author: Mario F. Triola
ISBN: 9780321836960

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Unusual/Unlikely Eventsa. The mean pulse rate for adult