Question

A certain group of test subjects had pulse rates with a mean of 73.4 beats per minute and a standard deviation of 12.7 beats per minute. Would it be unusual for one of the test subjects to have a pulse rate of 48.8 beats per​ minute?

Minimum​ "usual" value=_____beats per minute ​(Type an integer or a​ decimal.)

Maximum​ "usual" value=_____beats per minute ​(Type an integer or a​ decimal.)

Is 48.8 beats per minute an unusual pulse​ rate?

A. Yes comma because it is smaller than the minimum "usual" value.

B. ​Yes, because it is between the minimum and maximum​ "usual" values.

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

D. ​No, because it is larger than the maximum​ "usual" value. E. Yes comma because it is larger than the maximum "usual" value.

F. ​No, because it is smaller than the minimum​ "usual" value.

Answer 1

The mean and standard deviations of pulse rates for a certain group of test subjects are$\mu =73.4\mathrm{a}\mathrm{n}\mathrm{d}\sigma =12.7.$

Compute the minimum usual value.

μ−2σ = 73.4−2(12.7)

=73.4−25.4

=48

Compute the maximum usual value.

μ+2σ = 73.4+2(12.7)

=73.4+25.4

=98.8

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

\begin{array}{c}\\\mu - 2\sigma = 81.6 - 2\left( {11.4} \right)\\\\ = 81.6 - 22.8\\\\ = 58.8\\\end{array}