Question

A certain group of test subjects had pulse rates with a mean of 83.6 beats per minute and a standard deviation of 10.4 beats per minute. Would it be unusual for one of the test subjects to have a pulse rate of 74.4 beats per​ minute? Minimum​ "usual" valueequals nothing beats per minute ​(Type an integer or a​ decimal.) Maximum​ "usual" valueequals nothing beats per minute ​(Type an integer or a​ decimal.) Is 74.4 beats per minute an unusual pulse​ rate? A. No comma because it is between the minimum and maximum "usual" values. B. ​No, because it is smaller than the minimum​ "usual" value. C. ​No, because it is larger than the maximum​ "usual" value. D. Yes comma because it is smaller than the minimum "usual" value. E. Yes comma because it is larger than the maximum "usual" value. F. ​Yes, because it is between the minimum and maximum​ "usual" values.

Answer 1

Solution :

Given that ,

mean = = 83.6

standard deviation = = 10.4

Minimum usual value = - 2 * = 83.6 - 2 * 10.4 = 62.8

Maximum usual value = + 2 * = 83.6 + 2 * 10.4 = 104.4

74.4 beats per minute an unusual pulse​ rate is ,

No , because it is between the minimum and maximum "usual" values.