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motikmotik
3 years ago
11

Solve the equation using the distributive property and properties of equality.

Mathematics
2 answers:
RideAnS [48]3 years ago
6 0
7 1/2 ummm i did it in my head lol but i’m sure it’s right
Inessa [10]3 years ago
6 0
The answer Is def 7 1/2
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2 years ago
on a standardized exam the scores are normally distributed with a mean of 70 and a standard deviation of 20. find the z of a per
KIM [24]

The z-score of a person who scored 128 on the exam is equal to 2.9

<h3>What is a z-score?</h3>

A z-score is also referred to as a z-value or standard score and it can be defined as a measure of the distance between a raw score and the mean, when standard deviation units are used.

Mathematically, the z-score of a given sample score in a normal distribution can be calculated by using this formula:

z=\frac{x\;-\;u}{\sigma}

Where:

  • x represents the sample score.
  • u represents the mean score.
  • σ represents the standard deviation.

Substituting the given parameters into the formula, we have;

Z-score, z = (128 - 70)/(20)

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Read more on z-scores here: brainly.com/question/26714379

#SPJ1

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