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Paladinen [302]
3 years ago
9

In your job as a grocery cashier, a customer gives you a $20 bill to pay $3.99 for coffee, $3.49 for coffee creamer, and $7.29 f

or an apple pie. How much change should you give back?
Mathematics
2 answers:
guapka [62]3 years ago
8 0

Answer:

$5.23

Step-by-step explanation:

$3.99 + $3.49 + $7.29 = $14.77

$20 - $14.77 = $5.23

lukranit [14]3 years ago
5 0

Answer:

$5.23

Step-by-step explanation.

Coffee($3.99) + Coffee creamer($3.49) + Apple pie($7.29) = $14.77

$20 - $14.77 =$5.23

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Mia's checking account balance is overdrawn by $52.65.
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Answer:

A

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3 years ago
A set of test scores is normally distributed with a mean of 130 and a standard deviation of 30 What score is necessary to reach
nlexa [21]

Answer:

A score of 150.25 is necessary to reach the 75th percentile.

Step-by-step explanation:

Problems of normal distributions can be solved using the z-score formula.

In a set with mean \mu and standard deviation \sigma, the zscore of a measure X is given by:

Z = \frac{X - \mu}{\sigma}

The Z-score measures how many standard deviations the measure is from the mean. After finding the Z-score, we look at the z-score table and find the p-value associated with this z-score. This p-value is the probability that the value of the measure is smaller than X, that is, the percentile of X. Subtracting 1 by the pvalue, we get the probability that the value of the measure is greater than X.

A set of test scores is normally distributed with a mean of 130 and a standard deviation of 30.

This means that \mu = 130, \sigma = 30

What score is necessary to reach the 75th percentile?

This is X when Z has a pvalue of 0.75, so X when Z = 0.675.

Z = \frac{X - \mu}{\sigma}

0.675 = \frac{X - 130}{30}

X - 130 = 0.675*30

X = 150.25

A score of 150.25 is necessary to reach the 75th percentile.

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How can the order of operations be used to simplify expressions? Create your own unique example showing order of operations.
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