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.
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Answer:
1080 in.³
Step-by-step explanation:
The answer is in cubic inches, not inches.
V = LWH
V = (18 in.)(10 in.)(6 in.)
V = 1080 in.³
Answer:
the question is weird but heres what i think
Step-by-step explanation:
10+10=20
20x10+45
245+30=275
Answer:
4/25
Step-by-step explanation:
(-2/5) ^2
This means
( -2/5) * (-2/5)
4/25