MP3 players are manufactured with a 10% defective rate. if 9 players are selected from the assembly line, find the probability that at least 2 are defective.

Question

Bernoulli Experiments, using the binomial formula

C(n,k)*(p)^k*(1-p)^n-k

Answer 1

n=9   p=.1  

 

P(at least 2)=1-P(at most 1)=1-P(0)-P(1)   then use the formula to calculate P(0) and P(1)