here YZ=53

Y=5

Z=3

12. Find the z score of the following: i. x = 27, mean = 24.6, standard deviation = (3.2 + Y2) ii. 3: = (Y2 + 600), mean = 800, standard deviation = 150 16. The average wait time is (20 + Y.Z) minutes for the bus. You read this and think that the wait time is lower. A random sample of 30 bus routes are taken and the sample average wait is 21.5 minutes with a sample standard deviation of 10 minutes. At a = 0.05, is the wait time lower than the average? 15. Given the two random variabies X and '1' below, determine: {Assume all necessaryr assumptions apply.) a) The correlation coefficient b) Is there a strong linear correlation? Use or = 0.05. c) The line of best fit equation cl) 3\" for x = n\"- \f\fAbout M% of restaurants bills are incorrect. If 200 bills are selected at random, find: [5 marks} YZ M=1n+ a) The expected number of correct bills. b) The probability that at least 22 will contain an error? b) The probability that exactly 25 will contain an error