A certain group of test subjects had pulse rates with a mean of 70.2 beats per m

Question

A certain group of test subjects had pulse rates with a mean of 70.2 beats per minute and a standard deviation of 11.9 beats per minute. Would it be unusual for one the test subjects to have a pulse rate of 134.0 beats per minute? Minimum "usual" value = beats per minute. Maximum "usual" value = beats per minute Is 13.0 beats per minute an unusual pulse rate? A. Yes, because it is between the minimum and maximum "usual" values. B. No, because it is larger than the maximum "usual" value. C. Yes, because a is smaller than the minimum "usual" value. D. Yes, because it is larger than the maximum "usual" value. E. No, because it is between the minimum and maximum "usual" values. F. No, because it is smaller than the minimum "usual" value.

Explanation / Answer

The values which are 2 standard deviation away from mean would be considered unusual values.

Hence the minimum usual value would be given by,

Minimum Usual Value = 70.2-2*11.9 = 46.4 beats per minute.

The maximum usual value would be given by,

Maximum Usual Value = 72+2*11.9 = 94 beats per minute

Is 134.0beats per minute an unusual pulse rate?

Yes, because it is larger than the maximum "usual" value.

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