What three quantities are needed to calculate the variance? What three quantities are needed to calculate the variance? Post Navigation ← Buses arrive at a specified stop at 15-minute intervals starting at 7: That is, they arrive at 7:00, 7:15, 7:30, 7: A passenger arrives at the stop…The mean height of women in a country (ages 2029) is 64.4 inches. A random sample of 70 women in this age group is selected. →