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Eduardwww [97]
3 years ago
12

Todd wants to buy a new video game for $43.31. He has $55.50. The sales tax is 8.5% of the total purchase. Does Todd have enough

money?
It will be awesome if can be put into details:)
Mathematics
1 answer:
devlian [24]3 years ago
7 0
You would multiply $43.31 by 0.085 and add that to $43.31. You move the decimal left two spaces so you can turn the percent into a decimal. Then you would get the amount that that percent is of the total cost. You add that amount to the cost of the video game. Then you would see if it is greater/less than $55.50
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\displaystyle CI=(\hat{p}_1-\hat{p}_2)\pm z^*\sqrt{\frac{\hat{p}_1(1-\hat{p}_1)}{n_1}+\frac{\hat{p}_2(1-\hat{p}_2)}{n_2}}\\\\CI=\biggr(\frac{87}{249}-\frac{58}{113}\biggr)\pm 2.33\sqrt{\frac{\frac{87}{249}(1-\frac{87}{249})}{249}+\frac{\frac{58}{113}(1-\frac{58}{113})}{113}}\\\\CI=\{-0.2941,-0.0337\}

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The 98% confidence interval also suggests that it may be more likely that identified democrats in a rural area have a greater proportion than identified democrats in a city since the differences in the interval are less than 0.

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