the following data represent the number of appointments made per 15 minute interval by telephone sophitia tation for a lawn care company as you these are population data calculate the variance calculate the standard deviation and the given number of appointment is zero under one, one under 2, 2 under 3, 3 under 4 under 5, 5 under 6 and the given frequency is 31 and 57 and 26 and 14 and 6 and 3​