Answer:

Step-by-step explanation:
From the given information:
The sample size is 28
The population mean is 24.5 (ppb)
The sample mean is 225.3 (ppb)
Thus, the null and the alternative hypothesis can be computed as:
Null hypothesis:

Alternative hypothesis:

Mind sharing the information needed to answer the question? Thanks!
Answer:
5075 cents or 50.75
so sorry if it was wrong!