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SVEN [57.7K]
2 years ago
8

Select the correct answer. What is the value of this expression when a = 7 and b = -4?

Mathematics
1 answer:
iragen [17]2 years ago
6 0

Answer:

hhj

Step-by-step explanation:

nnh

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Answer:

\boxed {\boxed {\sf z=2.2}}

Step-by-step explanation:

The z-score tells us how many standard deviations a value is away from the mean.

The formula is:

z=\frac{x- \overline{x}}{s}

where x is the value, \overline {x} is the mean, and s is the standard deviation.

We want to find the z-score for the score of an 83, the mean is 72, and the standard deviation is 5.

x=83 \\\overline {x}= 72 \\s=5

Substitute the values into the formula.

z=\frac{83-72}{5}

Solve the numerator.

z=\frac{11}{5}

Divide.

z=2.2

The z-score is 2.2, which means the score of 83 is 2.2 standard deviations above the mean.

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Step-by-step explanation:

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