You sit outside the coffee shop in the student union and keep track of the amount of time (to the nearest minute) that a customer waits for their order. Your results are as follows: Time 0 1 2 3 4 5 Probability 0.08 .31 .32 .20 .08 .01     What is the mean wait time?   What portion of the customers have their order filled in 2 minutes of less?

Answer.

Complete the following probability distribution table: X -13 11 28 45 66 80 P(X) 0.13 0.12 0.18 0.15 0.22

A lab orders a shipment of 199 rats a week, 52 weeks a year, from a rat supplier for experiments that the lab conducts.  Prices for each weekly shipment of rats follow the distribution below:   Price $10.00 $12.50 $15.00 Probability 0.4 0.25 0.35 How much should the lab budget for next year's rat orders assuming this distribution does not change.  (Hint:  How much should they EXPECT to pay?)

K The following data represent the number of drivers involved in a fatal crash in 2016 in various light and weather conditions. Complete parts (a) through (c) below. Click the icon to view the data for fatal crashes in 2016. (a) Among fatal crashes in unknown weather conditions, what is the probability that a randomly selected fatal crash occurs when it is dawn/dusk? The probability that a randomly selected fatal crash in unknown weather conditions occurs when it is dawn/dusk is approximately. (Round to three decimal places as needed.) Data table Weather Daylight Dark, but Lighted 5875 497 51 54 255 Normal Rain Snow/Sleet Other Unknown 14,307 875 219 125 810 (...) Dark 8151 681 156 220 548 Dawn/Dusk Other 1183 87 40 71 65 8 2 9 133 X