Contaminated gun cartridges. A weapons manufacturer uses a liquid propellant to produce gun cartridges. During the manufacturing process, the propellant can get mixed with another liquid to produce a contaminated cartridge. A University of South Florida statistician hired by the company to investigate the level of contamination in the stored cartridges found that 23% of the cartridges in a particular lot were contaminated. Suppose you randomly sample (without replacement) gun cartridges from this lot until you find a contaminated one. Let x be the number of cartridges sampled until a contaminated one is found. It is known that the probability distribution for x is given by the formula
p(x) = (.23)(.77)x–1, x= 1, 2 , 3 , ⋯
a. Find p(1). Interpret this result.
b. Find p(5) . Interpret this result.
c. Find P(x≥ 2). Interpret this result.
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