A. x(x+7)=23 us the correct answer i believe
At a z-score of 1.80, the percentage of the scores that are better than yours is equal to 3.59%.
<h3>What is a z-score?</h3>
In Mathematics, a z-score is sometimes 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.
<h3>How to determine the percentage?</h3>
Mathematically, the z-score of a given sample score in a normal distribution can be calculated by using this formula:
Z-score = (x - μ)/σ
Where:
- x represents the sample score.
- σ represents the standard deviation.
- μ represents the mean score.
Since a score of 85 on a test corresponds to a z-score of 1.80, the percentage of the scores that are better than yours is given by:
P(x > 85) = P(z > 1.80)
P(z > 1.80) = 0.0359
P(z > 1.80) = 3.59%.
Read more on z-scores here: brainly.com/question/26714379
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Answer:
920
So, 0.45=920 as a proper fraction in simplest form.
You're looking for the percent, so your equation would be:
x% × 200 = 0.5
(x/100) × 200 = 0.5
2x = 0.5
x = 0.25
So, 0.25% of 200 is 0.5.
* You can check your work by multiplying 0.25% × 200. Surely enough, it does give you 0.5.
Answer = 0.25%
