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2 years ago

8

Joanna receives 8$ an hour when she works at the coffee shop plus she earns tips as well. Last week she made 40$ in tips and ear

ned a total of $256. Write an equation and use to find the number of hours Joanna worked last week.

1 answer:

densk [106]2 years ago

3 0

Answer:

she worked 17 hours

Step-by-step explanation:

first you subtract 256-40

then you get 216 and divide by 8

then you get 27 as an answer

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Answer:

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Step-by-step explanation:

For solving this question we need to find out the z-scores for both methods,

Since, the z-score formula is,

$z=\frac{x-\mu}{\sigma}$

Where, $\mu$ is mean,

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Given,

For method A,

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Thus, the z score for 34 is,

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While, for method B,

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$\sigma = 4$

Thus, the z score for 34 is,

$z_2=\frac{34-37}{4}=-0.75$ ,

Since, $z_1 > z_2$

Hence, method A is preferred if the procedure must be completed within 34 minutes.

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