Hey all. Im doing maths methods 5 (i live in Australia) and I've run into this problem. Code (Text): A university study investigated the increase in heart rates(measured in beats per minute) of people undertaking a particular exercise. The increases in heart rate were normally distributed with a mean of 40 and a standard deviation of 9. It was determined that the proportion of people classified as unfit (x >= 50) is 15% and the proportion of people classified as very fit (x <= 22) is 10%. Find the mean and standard deviation of the increases in heart rate for this university study. I've no idea how to do this. Most of these types of problems I have been doing on a graphics calculator, which is allowed and expected in this course. The model of calculator I have is a CASIO fx-9860G AU. Any help in solving this problem will be greatly appreciated. Thanks for reading.