A certain group of test subjects had pulse rates with a mean

A certain group of test subjects had pulse rates with a mean of 83.7 beats per minute and a standard deviation of 10.3 beats per minute. Would it be unusual for one of the test subjects to have a pulse rate of 94.3 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 94.3 beats per minute an unusual pulse rate? Yes, because it is smaller than the minimum \"usual\" value. No, because it is smaller than the minimum \"usual\" value. Yes, because it is larger than the maximum \"usual\" value. No, because it is larger than the maximum \"usual\" value. No, because it is between the minimum and maximum \"usual\" values. Yes, because it is between the minimum and maximum \"usual\" values.

Solution

Usual values are usually defined as within 2 standard deviations from the mean. [If you use another standard, please resubmit the question, together with the definition of \"usual.\"]

Thus, the usual values lie between

minimum = u - 2*sigma = 83.7 - 2*10.3 = 63.1 [answer]

maximum = u + 2*sigma = 83.7 + 2*10.3 = 104.3 [answer]

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As 94.3 is between these two values, it is not unusual.

Hence, the answer is OPTION E. [ANSWER]