The frequency distribution shown represents the number of drivers in fatal crashes in 1996 for females aged 20 to 84.

of drivers 1747 1558 Age 20-24 25-29 30-34 35-39 40-44 45-49 50-54 55-59 60-64 65-69 70-74 75-79 80-84 a) Approximate the mean. 1561 1503 1180 957 752 522 498 491 b.) Approximate the variance. c.) Approximate the standard deviation. 550 485 314 2. Use the sample data: 3.91 8.05 11.72 9.6 12.57 12.89 9.81 11.72 3.99 3.79 5.5 4.71 7.66 8.5 11.8 17.99 21.4 4.85 a.) Compute the z-score corresponding to 11.72. 10.89 10.3 11.56 7 10.72 21.82 22.62 10.74 3.02 7.45 11.33 7.11 7.31 9.29 21 7.92 17.9 16.92 4.6 8.5 4.8 4.9 9.1 7.9 8.37 11.97 7.85 9.11 8.79 b.) Determine the quartiles. c.) Compute the inter-quartile range. d.) Determine if there are any outliers (Compute the upper and lower fence)? UF- LF- e.) Find Ps. f.) Construct a boxplot. Be sure to label the plot.