The following data represent the number of appointments made per 15-minute interval by telephone solicitation for a lawn-care company. Assume these are population data.
Number of Appointments Frequency of Occurrence
0-under 1 31
1-under 2 57
2-under 3 26
3-under 4 14
4-under 5 6
5-under 6 3
Calculate the median. (Round your answer to 3 decimal places.)
Calculate the variance. (Round your answer to 4 decimal places.)
Calculate the standard deviation (Round your answer to 4 decimal places.)