3 years ago

Sandra’s lunch came to $12.84 plus 15% tax. What was the total cost of her lunch?

1 answer:

4 0

The total would be $14.77

because we will do 0.15x12.84 which is 14.766 but since this is money we round to the nearest hundredth , and that is $14.77

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Answer:

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Step-by-step explanation:

Sample size (n) = 50

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Sample standard deviation (s) = 18 grams

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The confidence interval for the true mean breaking strength of cotton threads of this type, at a 90% confidence level, is given by:

$CI=X \pm Z*\frac{s}{\sqrt n}\\CI=210 \pm 1.645*\frac{18}{\sqrt 50}\\CI = 210 \pm 4.19\\CI =205.81\ to\ 214.19$

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