<span>To find the margin of error for the mean of a normally distributed
population from a sample, the critical probability,
, is obtained by
where p is the confidence level.
Assuming a
confidence level of 86%, the critical probability is given by
</span>
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Information
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Amount = $400
Interest rate = 4% a year
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Equation
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Total amount = 400 + 0.04(400)
Total amount = 400 + 16
Total amount = $416
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Answer: Total Amount = 400 + 0.04(400)
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There is no solution since ln(0) is undefined
I guess you need help with #3
So you have to 642 by 5
By the way, this is a great question for a calculator to check your answer
The answer 128.4
