The following representsthe number of citizen calls for service to the police in a random sample of census blocks over a period of several years (N = 11). For this question, you must calculate the mean and several measures of dispersion. Specifically, calculate the mean, the range, the variance, and the standard deviation.

Note: For your own calculations, it will be helpful to arrange the numbers in a table and calculate the mean deviation and the squared mean deviation.

Important: Please use two decimal spaces (i.e., 0.00) for answers.

Calls for Service to the Police (N = 11)
Block ID	# Calls for Service
Block 1	72
Block 2	44
Block 3	7
Block 4	39
Block 5	79
Block 6	51
Block 7	120
Block 8	4
Block 9	9
Block 10	581
Block 11	16

Mean = ; Range = ; Variance = ; Standard Deviation =