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

mean=69.3 standard deviation=3.96

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?