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pluto31
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1. Homework Statement [
A stockpile of 40 relays contain 8 defective relays. If 5 relays are selected random, and the number of defective relays is known to be greater than 2, what is the probability that exactly four relays are defective?
Calculus of probability
I've been try to find the solution but I got confused. Can you guys help me?
This is my solution :
the probability from defective relays is : 8/40, the probability from 5 random is : 5/40 and the probability of 4 defective from 5 random select is : 4/5.
so my solution is ((5/40)/(8/40))x(4/5) = 25/32 =0.7815
is this right or my solution is wrong ... thanks
A stockpile of 40 relays contain 8 defective relays. If 5 relays are selected random, and the number of defective relays is known to be greater than 2, what is the probability that exactly four relays are defective?
Homework Equations
Calculus of probability
The Attempt at a Solution
I've been try to find the solution but I got confused. Can you guys help me?
This is my solution :
the probability from defective relays is : 8/40, the probability from 5 random is : 5/40 and the probability of 4 defective from 5 random select is : 4/5.
so my solution is ((5/40)/(8/40))x(4/5) = 25/32 =0.7815
is this right or my solution is wrong ... thanks