Answer:
I think A=66.67?Not too sure,sorry if I am wrong
Step-by-step explanation:
Well you could do
6+2
7+1
1+1+1+1+1+1+1+1
5+3
4+4
2+2+2+2
1+1+1+2+2+1
Hoped I helped please mark brainlyess:)!
And If you need help with anything else just let me know. :)
Answer:
89.44%
Step-by-step explanation:
Problems of normally distributed samples are solved using the z-score formula.
In a set with mean
and standard deviation
, the zscore of a measure X is given by:
![Z = \frac{X - \mu}{\sigma}](https://tex.z-dn.net/?f=Z%20%3D%20%5Cfrac%7BX%20-%20%5Cmu%7D%7B%5Csigma%7D)
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.
In this question:
![\mu = 45, \sigma = 5.6](https://tex.z-dn.net/?f=%5Cmu%20%3D%2045%2C%20%5Csigma%20%3D%205.6)
If you score 52 on the test, what percentage of test takers scored lower than you?
This is the pvalue of Z when X = 52.
![Z = \frac{X - \mu}{\sigma}](https://tex.z-dn.net/?f=Z%20%3D%20%5Cfrac%7BX%20-%20%5Cmu%7D%7B%5Csigma%7D)
![Z = \frac{52 - 45}{5.6}](https://tex.z-dn.net/?f=Z%20%3D%20%5Cfrac%7B52%20-%2045%7D%7B5.6%7D)
![Z = 1.25](https://tex.z-dn.net/?f=Z%20%3D%201.25)
has a pvalue of 0.8944.
So 89.44% of test takers scored lower than you.
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