If a group of students tested had 200 participants, how many students had pulses between 68 and 76?

Algebra
Tutor: None Selected Time limit: 1 Day

Students had their pulses taken and the following data is reported: x=72 SD=4

Oct 28th, 2015

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In this problem x stands for the mean and SD the standard deviation. With the mean = 72 and SD = 4, the students with pulses between 68 and 76 are all of the students within one standard deviation of the mean. In general, about 68% of the population falls within one standard deviation of the mean, 95% within two standard deviations and 99.7% within three standard deviations.

To answer the question, 68% of 200 is .68 * 200 = 136. So 136 students have pulses in the range of 68 and 76 beats per minute.

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Oct 28th, 2015

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