Question 581222: Please help I will pay for tutoring if I can get this answer right
The number of times the SAT was taken and the number of students are as follow
Number of times Number of students
1 721,769
2 601,325
3 166,736
4 22,299
5 6,730
Let x be a random variable indicating the number of times a student takes the SAT. Show the probability for this random vaiable.(to 4 decimals)
x=1
x=2
x=3
x=4
x=5
My answer was
1-7217.69
2-3006.62
Found 2 solutions by stanbon, ash.ghadge:
Answer by stanbon(75887)   (Show Source):
You can put this solution on YOUR website! The number of times the SAT was taken and the number of students are as follow
Number of times Number of students
1 721,769
2 601,325
3 166,736
4 22,299
5 6,730
---
Total number os students = 1518859
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Let x be a random variable indicating the number of times a student takes the SAT. Show the probability for this random vaiable.(to 4 decimals)
P(x=1) = 721769/1518859 = 0.4752
P(x=2) = 601,325/1518859 = 0.3959
etc. (Use the same method to find the following probabilities)
x=3
x=4
x=5
=============
Cheers,
Stan H.
Answer by ash.ghadge(2) (Show Source):
You can put this solution on YOUR website! probability: p(x) = 
x(no. of attempts of CAT) | f(x)(no. of students | p(x) (probability)
1 | 721,769 | 721,769/1518,859 = 0.4752
2 | 601,325 | 601,325/1518,859 = 0.3959
3 | 166,763 | 166,763/1518,859 = 0.1098
4 | 22,299 | 22,299/1518,859 = 0.0147
5 | 6,730 | 6,730/1518,859 = 0.0044
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sum | 1518,859 | 1
find sum of all students. it is sum f(x) = 1518,859
and sum of probabilitis should be 1 always.
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