Question 1035691
55 to 65 are 1 standard deviation from the mean 60, and hence by the empirical rule, around 68% of all observations lie bet ween 55 and 65.


50 to 70 are 2 standard deviations from the mean 60, and hence by the empirical rule, around 95% of all observations lie bet ween 50 and 70.


45 to 75 are 3 standard deviations from the mean 60, and hence by the empirical rule, around 99.7% of all observations lie bet ween 45 and 75.