I cant really see the numbers (3-4) which do u need
Using the normal distribution, it is found that 44.43% of students are 21 or older and thus old enough to legally order alcohol at Griff's.
<h3>Normal Probability Distribution</h3>
The z-score of a measure X of a normally distributed variable with mean
and standard deviation
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 above or below the mean.
- Looking at the z-score table, the p-value associated with this z-score is found, which is the percentile of X.
The mean and the standard deviation are given, respectively, by:
![\mu = 20.66, \sigma = 2.4](https://tex.z-dn.net/?f=%5Cmu%20%3D%2020.66%2C%20%5Csigma%20%3D%202.4)
The proportion of students that are 21 or older is <u>one subtracted by the p-value of Z when X = 21</u>, hence:
![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{21 - 20.66}{2.4}](https://tex.z-dn.net/?f=Z%20%3D%20%5Cfrac%7B21%20-%2020.66%7D%7B2.4%7D)
Z = 0.14
Z = 0.14 has a p-value of 0.5557.
1 - 0.5557 = 0.4443 = 44.43% of students are 21 or older and thus old enough to legally order alcohol at Griff's.
More can be learned about the normal distribution at brainly.com/question/4079902
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Answer:
8 weeks.
Step-by-step explanation:
There are 7 days in a week so the answer is 56/7 = 8 weeks.
Y=2/3x+7 would be slope intercept form