4. (2 Mark) The mean and standard deviation for the exam results from a class of 125 students were calculated, mean = 72, SD = 12 with a normal distribution. How many students would be expected to have a mark between C and A (60 & 90)? Hint: you need to calculate the z-score for both grades to get the total area. Once again can't have part of a student. 5. (2 Marks) Suppose the mean resting heart rate of females aged 20 is mean = 65, standard deviation = 4 beats/min. and of males aged 25 is mean = 68, standard deviation = 6 and both are normally distributed. In general, the lower the resting heart rate the fitter the individual. If a certain female, aged 20 has a rate of 61 and a male aged 25 has a rate of 65, how do these individuals compare with respect to fitness level? Express your answer in terms of percentiles.