Question

Q1:

One prominent physician claims that 75% of those with lung cancer are chain smokers. If his assertion is correct, find the probability that of 7 such patients recently admitted to a hospital, more than 5 are chain smokers. Find the mean and standard deviation of this distribution.

Q2:

It is known that 20% of products on a production line are defective. a. Randomly pick 5 products. What is the probability that exactly 2 are defective? b. Products are inspected until first defective is encountered. Let X = number of inspections to obtain first defective. What is the probability that X=5?

Answer 1