- #1

Hamish Cruickshank

- 5

- 0

Im doing maths methods 5 (i live in Australia) and I've run into this problem.

Code:

```
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.