Answer:
4
Step-by-step explanation:
I = PRT
252 = (900)(.07)(T)
252 = (63)(T)
divide 63 from both sides
4 = T
Answer: 68
Step-by-step explanation:
As per given , we have
Population standard deviation : 
Critical value for 90% confidence interval =
Margin of error : E= 0.8 milligrams
The formula to find the sample size is given by :-

i.e. 

Hence, the limnologist must analyze 68 samples.
Answer:
sorry I need to answer this I'll give you the right answer soon I swear