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GREYUIT [131]
2 years ago
8

The sum of 81 and a number is greater than 4 times the same number

Mathematics
1 answer:
kipiarov [429]2 years ago
8 0

Answer: n=9

Step-by-step explanation:

81 = n>4*n

81 = 9(>4)*9

81 = 9*9

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Banking fees have received much attention during the recent economic recession as banks look for ways to recover from the crisis
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Answer:

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Step-by-step explanation:

We have that to find our \alpha level, that is the subtraction of 1 by the confidence interval divided by 2. So:

\alpha = \frac{1-0.95}{2} = 0.025

Now, we have to find z in the Ztable as such z has a pvalue of 1-\alpha.

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Now, find the margin of error M as such

M = z*\frac{\sigma}{\sqrt{n}}

In which \sigma is the standard deviation of the population and n is the size of the sample.

M = 1.96*\frac{1.86}{\sqrt{41}} = 0.57

So the answer for b) is $0.57.

The lower end of the interval is the sample mean subtracted by M. So it is 12.22 - 0.57 = $11.65

The upper end of the interval is the sample mean added to M. So it is 12.22 + 0.57 = $12.79

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3 years ago
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