A certain group of test subjects had pulse rates with a mean of 76.5 beats per m

Question

A certain group of test subjects had pulse rates with a mean of 76.5 beats per minute and a standard deviation of 10.1 beats per minute. Would it be unusual for one of the test subjects to have a pulse rate of 126.7 beats per minute? Minimum'usuar value-D beats per minute Type an integer or a decimal.) value beats per minute Maximum "usual value-beats per minute (Type an integer or a decimal.) s 126.7 beats per minute an unusual pulse rate? O A. Yes, because it is larger than the maximum "usual value. O B. Yes, because it is smaller than the minimum "usual" value ° C. Yes, because it is between the minimum and maximum "usual" values. O D. No, because it is between the minimum and maximum "usual" values. O E. No, because it is larger than the maximum "usual" value. ° F. No, because it is smaller than the minimum "usual" value.

Explanation / Answer

Given that mean = 76.5 and standard deviation = 10.1

a)

minimum "usual" value = mean - 2*sd = 76.5 - 2*10.1 = 56.3 beats per minute

b)

maximum "usual" value = mean + 2*sd = 76.5 + 2*10.1 = 96.7 beats per minute

c)

126.7 is not in range between minimum "usual" value and maximum "usual" value i.e [56.3, 96.7]. so it is unusual value

so answer is (A) Yes, beacuse it is larger than the maximum "usual" value

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