A certain group of test subjects had pulse rates with a mean of 77.4 beats per m

Question

A certain group of test subjects had pulse rates with a mean of 77.4 beats per minute and a standard deviation of 10.2 beats per minute Would it be unusual for one of the test subjects to have a pulse rate of 127.8 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 127.8 beats per minute an unusual pulse rate? A. No, because is between the minimum and maximum "usual values. B. Yes, because it is larger than the maximum "usual" value. c Yes, because it is smaller than the minimum "usual" value. D, Yes, because it is between the minimum and maximum "usual" values. E. No, because it is lager than the maximum "usual" value. F. No, because it is smaller than the minimum "usual" value.

Explanation / Answer

Minimum usual value = sample mean - 2 * std . dev. = 77.4 - 2 * 10.2 = 57 beats per minute

Maximum usual value = sample mean + 2 * std . dev. = 77.4 + 2 * 10.2 = 97.8 beats per minute

Here option B is correct That 127.8 beats per minute is an unusual pulse rate because it is larger than the maximum "usual" value.

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