THINKING The masses of Statistics students believed to normally distributed. The messes, in kg, of random sample of 36 students are: 62 63 63 64 64 65 67 67 68 68 68 68 66 67 67 67 68 68 70 70 70 71 71 71 70 71 71 71 71 72 74 75 75 77 77 78 a. Determine the mean and standard deviation of this data. [2] mean : 69.3 Standard deviation= 4.0 b. What is the probability that the mass of a randomly selected Statistics student will be at least 70kg? [2] c. Of 120 Statistics students, how many would you expect to have a mass greater than 65 kg? [2] 3