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jonmorton159
11.03.2021 •
Mathematics
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Ответ:
,l.uogtgbv mjbnh
Step-by-step explanation:
Ответ:
40.13%
Step-by-step explanation:
We have been given that scores on the quantitative portion of an exam have a mean of 563 and a standard deviation of 144. Assume the scores are normally distributed.
We are asked to find the percentage of students taking the quantitative exam, who scored above 599.
First of all we will find z-score corresponding to 599 using z-score formula.
z = z-score,
x = Random sample score,
Now we will use normal distribution table to find the probability of z-score greater than 0.25 that is
.
Using formula
, we will get:
Let us convert 0.40129 into percentage as:
Therefore, approximately 40.13% of students taking the quantitative exam will score above 599.