
#1
Apr212, 06:24 AM

P: 12

"Suppose that ten cards, of which five are red and five are green, are placed randomly in ten envelopes, of which five are red and five are gree. What is the probability that exactly x envelopes will contain a card with a matching colour? (x = 0, 1, 2, ..., 10)"
So basically, there are six events in sample space that 5 green envelopes have 0, 1, 2, 3, 4, or 5 green cards. Therefore p.d.f. is 1/6 for x = 0, 2, 4, 6, 8, 10, and zero otherwise? 


Register to reply 
Related Discussions  
Probability question; Conditional probability and poisson distribution  Precalculus Mathematics Homework  1  
Probability Question About "The Poisson Probability Distribution"  Calculus & Beyond Homework  15  
[probability theory] simple question about conditional probability  Precalculus Mathematics Homework  1  
hard probability question (cambridge exam question)  Set Theory, Logic, Probability, Statistics  3  
[SOLVED] Series Question (from a probability question)  Calculus & Beyond Homework  3 