The time to complete an exam is approximately normal with a mean = 45 minutes and a standard deviation = 8 minutes. The bell curve below represents the distribution for testing times.

Question

The scale on the horizontal axis is equal to the standard deviation.

Put the data in order according to the scale indicated.

 

37

53

69

61

21

45

29



Answer 1

21 29 37, 45, 53, 61, 69

mean - 3 standard deviations

mean -2 sd

mean -1 sd

mean

mean + 1 sd

mean +2 sd

mean + 3 sd