Use the range rule of thumb for identifying significant values to identify the limits separating values that are significantly low or significantly high

Question

Body and exam measurements were collected from 300 subjects. The pulse rates from 100 males have a mean of

68.8

beats per minute and a standard deviation of

10.9

beats per minute. Use the range rule of thumb for identifying significant values to identify the limits separating values that are significantly low or significantly high. Is a pulse rate of

60.0

beats per minute significantly​ low, significantly​ high, or​ neither? (All of these pulse rates are measured at​ rest.) Explain.

Answer 1

(68.8-60)/10.9(sqr300) = 0.0466

I'd go with neither, not significantly lower or higher. .04 rounded off to one decimal = zero