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2 years ago

7

At a collector's fair, Jason sold six sports cards at $56 each and bought eight sports cards at $43 each. What was Jason's net p

rofit and loss?
(Order of Operations and integers)

1 answer:

ycow [4]2 years ago

4 0

Answer:

He lost $8

Step-by-step explanation:

sold 6 x $56 = $336

bought 8 x $43 = $344

344 - 336 = $8

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2 years ago

The water works commission needs to know the mean household usage of water by the residents of a small town in gallons per day.

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Answer:

A sample of 179 is needed.

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:

$\alpha = \frac{1 - 0.85}{2} = 0.075$

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

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A previous study found that for an average family the variance is 1.69 gallon?

This means that $\sigma = \sqrt{1.69} = 1.3$

If they are using a 85% level of confidence, how large of a sample is required to estimate the mean usage of water?

A sample of n is needed, and n is found for M = 0.14. So

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

$0.14 = 1.44\frac{1.3}{\sqrt{n}}$

$0.14\sqrt{n} = 1.44*1.3$

$\sqrt{n} = \frac{1.44*1.3}{0.14}$

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