SOLUTION: What probability rule is this and how to I solve it?
From a group of 9 people, you randomly select 4 of them.
What is the probability that they are the 4 oldest people in the
Algebra.Com
Question 468918: What probability rule is this and how to I solve it?
From a group of 9 people, you randomly select 4 of them.
What is the probability that they are the 4 oldest people in the group?
Give your answer as a fraction.
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
From a group of 9 people, you randomly select 4 of them.
What is the probability that they are the 4 oldest people in the group?
-------------
There is only 1 group of the 4 oldest.
There are 9C4 = (9*8*7*6)/(1*2*3*4) = 126 groups
---
P(select the 4 oldest) = 1/126
------------------
Cheers,
Stan H.
RELATED QUESTIONS
From a group of 11 people, you randomly select 4 of them. What is the probability that... (answered by ikleyn)
From a group of 7 people, you randomly select 3 of them.
What is the probability that... (answered by josmiceli,ikleyn)
From a group of 8 people, you randomly select 4 of them.
What is the probability that... (answered by ewatrrr)
From a group of 11 people, you randomly select 3 of them. Find the probability that at... (answered by jim_thompson5910)
A researcher asked 36 people if they liked a new brand of toilet paper.
22 said "yes", 8 (answered by ewatrrr)
In a group of 1000 people 900 are female.
If 2 people are randomly selected, what is the (answered by ewatrrr)
If you randomly select a letter from the phrase "Mathletes rule the world," what is the... (answered by ikleyn)
The most common human blood group is O which is estimated to be 45% in US population. If... (answered by Boreal)
The US Senate consists of 13 women and 18 men. If you randomly select five different... (answered by stanbon,KMST)