The table below shows the number of one company's stores located in each of 50 regions. Complete parts (a) through (c) below. 66 23 80 55 564 81 67 19 14 306 0 30 125 20 29 195 120 67 55 75 85 116 158 50 28 40 100 82 96 40 57 67 232 22 156 45 342 140 9 202 143 114 38 105 70 25 86 407 45 19 a. Compute the mean, variance, and standard deviation for this population. The population mean is u = 102.8 . (Type an integer or a decimal. Round to one decimal place as needed.) The population variance is of = 11280 (Round to the nearest integer as needed.) The population standard deviation is o = 106.2 . (Type an integer or a decimal. Round to one decimal place as needed.) b. What percentage of the 50 regions have stores within +1, +2, or + 3 standard deviations of the mean? The percentage within 1 1 standard deviation of the mean is%. (Type an integer or a decimal. Do not round.)