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;
![(12)/(32)\text{ }*\text{ 100 = 37.5\%}](https://img.qammunity.org/2023/formulas/mathematics/high-school/asy90toz182zd2ab61kn3nce2n7u98ykl3.png)
From the above, we can see that 37.5% is affected
So, to get the number affected on the larger scale, we have that;
![(37.5)/(100)\text{ }*\text{ 1200 = 450}](https://img.qammunity.org/2023/formulas/mathematics/high-school/5t2njjmtpkzpwt9adc5u7dowzt3rj9flmh.png)