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3 years ago

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A laptop has a listed price of 615.98 before tax. If the sales tax rate is 6.25% , find the total cost of the laptop with sales

tax included.

1 answer:

Vadim26 [7]3 years ago

7 0

Answer:

$654.48

Step-by-step explanation:

$615.98 x 0.0625 = $38.50

$615.98 + $38.50 = $654.48

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Answer:

$7-3.182 \frac{13.638}{\sqrt{4}}= -14.698$

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Step-by-step explanation:

For this case we have the following info given:

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We define the random variable $D = before-after$ and we can calculate the inidividual values:

D: 10, -5, 25, -2

And we can calculate the mean with this formula:

$\bar X= \frac{\sum_{i=1}^n X_i}{n}$

And the deviation with:

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And after replace we got:

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And the confidence interval for this case would be given by:

$\bar D \pm t_{\alpha/2} \frac{s_d}{\sqrt{n}}$

The degrees of freedom are given by:

$df = n-1= 4-1=3$

For the 95% of confidence the value for the significance is $\alpha=0.05$ and the critical value would be $t_{\alpha/2}= 3.182$ . And replacing we got:

$7-3.182 \frac{13.638}{\sqrt{4}}= -14.698$

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