Police records shows the following numbers of daily crime reports for a sample of days during the winter months and a sample of days during the summer months. Winter 18 20 15 16 21 20 12 16 19 20 Summer 28 18 24 32 18 29 23 38 18 a. Compute the range and interquartile range for each period b. Compute the variance and standard deviation for each period c. Compute the coefficient of variance for each period d. Compare the variability of the two periods