Question

68% of the data is within 1 standard deviation () of the mean (), 95% of the data is within 2 standard deviations () of the mean (), and 99.7% of

Answer 1

For an approximately normal data set, the values within one standard deviation of the mean account for about 68% of the set; while within two standard deviations account for about 95%; and within three standard deviations account for about 99.7%.