Analyze Datasets

Question

or the following set of data, find the percentage of data within 1 population standard deviation of the mean, to the nearest percent.

67, 69, 76, 55, 66, 69, 65, 68, 63

Answer 1

mean = 66 4/9

standard deviation = about 5.293835

all the 9 numbers are within 1 standard devation except 55 and 76. 7/9 = 77.77...% = 77.8% rounded to nearest tenth

77.8% are within 1 standard devation of the mean