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Permutations?

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by gmobley10 » Fri Jun 21, 2013 1:00 pm
Here are two questions that I am completely stuck on. Im not even sure if they would be solved via permutation/combination formulas...
In the second I am so confused because it seems like the first sentence answers the question... PLEASE if you are able to answer either of these can you possibly take the time to show me your process? I am just so stumped as to how to approach these two.

1. The Gallup Poll reported that 52% of Americans used a seat belt the last time they got into a car. If 4 people are selected at random, find the probability that they all used a seat belt the last time they got into a car.

2. At a large university, the probability that a student takes calculus and on the dean's list is 0.042. The probability that a student is on the dean's list is 0.21. Find the probability that the student is taking calculus, given that he or she is on the dean's list.
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Source: — Problem Solving |

by srcc25anu » Sun Jun 23, 2013 2:12 pm
Lets say # Americans= 100
# Americans who used a SB = 52
# Americans who DONT used a SB = 48
Prob that 4 are selected out of 52 = 52C4
Total Prob to select 4 Americans out of 100 = 100C4
therefore rquired prob = 52c4 / 100C4

What;s the OA?
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by vivekchandrams » Tue Jun 25, 2013 12:12 pm
Hi gmobley10,

You have a similar post here: https://www.beatthegmat.com/statistics-t265225.html

Please let me know if you need additional explanation regarding the same
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