Defective Gas Masks Time magazine reported that when 19,218 gas masks from branches of the U.S. military were tested, it was found that 10,322 were defective

(based on data from the World Health Organization). If further investigation begins with the random selection of two gas masks from this population, find the probability that they are both defective.

a. Assume that the first gas mask is replaced before the next one is selected.

b. Assume that the first gas mask is not replaced before the second item is selected.

c. Compare the results from parts

(a) and (b).

d. Given a choice between selecting with replacement and selecting without replacement, which choice makes more sense in this situation? Why?