It is expected that 450 out of the total 1,200 are to be affected by parasites
Here, using a study of sample, we want to infer the number of casualty in a larger sample
To do this, we need to get the percentage of the Deers that are affected by parasites
We can have this as;

From the above, we can see that 37.5% is affected
So, to get the number affected on the larger scale, we have that;
