SOLUTION: A production process is known to produce 10% defectives. A buyer purchases 30 of these items. What is the probability that 5 or less items are defective? (b) What is the

Algebra ->  Probability-and-statistics -> SOLUTION: A production process is known to produce 10% defectives. A buyer purchases 30 of these items. What is the probability that 5 or less items are defective? (b) What is the       Log On


   

Question 1159483: A production process is known to produce 10% defectives. A buyer purchases 30 of these items.
What is the probability that 5 or less items are defective?

(b) What is the probability that exactly 2 items are defective?
Answer by Boreal(15235) About Me  (Show Source):
You can put this solution on YOUR website!
it is a binomial looking at the probability 0 to 5 are defective given that the probability of each is 0.1.
That is 0.9268. 2nd VARS, binomcdf (30,.1,5)
exactly 2 items are defective is 0.2277
2nd VARS, binompdf (30, .1, 2)
also for this one 30C2*0.9^28*0.1^2