The resting heart rates for a group of men involved in a clinical trial of a new medication were recorded at the beginning of the study. The results in beats per minute were 70, 87, 66, 67, 75, 78, 78, 82, 71, 74, 82, and 69.9. Calculate the mean, the median, and the mode of the resting heart rates of the group.
A) Mean: 69.9 beats/minute; median: 78.0 beats/minute; mode: 78 beats/minute
B) Mean: 70.9 beats/minute; median: 79.0 beats/minute; mode: 79 beats/minute
C) Mean: 71.9 beats/minute; median: 80.0 beats/minute; mode: 80 beats/minute
D) Mean: 72.9 beats/minute; median: 81.0 beats/minute; mode: 81 beats/minute
E) Mean: 73.9 beats/minute; median: 82.0 beats/minute; mode: 82 beats/minute

Question

Quizplus · Accepted Answer

To find the mean: add all the numbers and divide by the total number of numbers
(70+87+66+67+75+78+78+82+71+74+82+69.9)/12 = 76.00 beats/minute (rounded to two decimal places)

To find the median: arrange the numbers in order from smallest to largest and find the middle number. If there are an even number of numbers, take the average of the two middle numbers.
66, 67, 69.9, 70, 71, 74, 75, 78, 78, 82, 82, 87 
The middle two numbers are 78 and 78, so the median is (78+78)/2 = 78.0 beats/minute

To find the mode: determine which number appears most often
78 beats/minute appears twice, while all the other numbers appear only once, so the mode is 78 beats/minute.

The Resting Heart Rates for a Group of Men Involved