Section B A manufacturer of Wi-Fi routers is investigating the maximum distance (measured in meters) at which a signal can be detected to a certain level for their product. Let D be the random variable of this maximum distance. A frequency distribution of values of D was produced for a random sample of 200 routers; it is shown in the table below. For each group. L. denotes the lower bound, U, is the upper bound and f; is the frequency. The last column shows values for group i of the quantity (0,-E) Ex Li Mid U f (0-5) 210 2125 215 7 1.0418 215 217.3 220 15 0.9947 220 227.5 225 44 0.0220 225 2275 230 70 1.7887 230 232.5 235 38 1.1607 235 237.5 240 20 ? 240 242.5 245 6 ? 200 3. Calculate the two probabilities P[235m