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4 years ago

10 po

Mathematics

1 answer:

ozzi4 years ago

8 0

Answer:

42.40

Step-by-step explanation:

Discount = Original Price x Discount %/100

Discount = 49.88 × 15/100

Discount = 49.88 x 0.15

You save = $7.48

Final Price = Original Price - Discount

Final Price = 49.88 - 7.482

Final Price = $42.40

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Airida [17]

Answer:

$ME=\frac{Upper-Lower}{2}= \frac{8.15-6.55}{2}= 0.80$

Step-by-step explanation:

Previous concepts

A confidence interval is "a range of values that’s likely to include a population value with a certain degree of confidence. It is often expressed a % whereby a population means lies between an upper and lower interval".

The margin of error is the range of values below and above the sample statistic in a confidence interval.

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$\bar X$ represent the sample mean for the sample

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s represent the sample standard deviation

n represent the sample size

Solution to the problem

The confidence interval for the mean is given by the following formula:

$\bar X \pm t_{\alpha/2}\frac{s}{\sqrt{n}}$ (1)

For this case the confidence interval is given by (6.55,8.15). And we can estimate the margin of error with this formula since the confidence interval is symmetrical:

$ME=\frac{Upper-Lower}{2}= \frac{8.15-6.55}{2}= 0.80$

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