Question 931620: BINOMIAL DISTRIBUTION
Last Question.
A city law enforcement official has started that 20% of the items sold by pawn shops within the city have been stolen. ralph has just purchase 4 items from one of the city's pawn shops. assuming that the official is correct and fo the X= the number of ralph purchases that have been stolen, determine the following
a) E(x) b) P(X=0) c) P(x=2)
Answer by ewatrrr(24785)   (Show Source):
You can put this solution on YOUR website! p(stolen) = .20, n = 4
p(not stolen) = .80
......
E(x) = .2(4) = .8
P(x = 0) = .8^4
P(x = 2) = 4C2(.2^2)(.8)^2 0r binompdf(4, .2, 2) = .1536 0r 15.36%
......
Re TY
to find .1536
either calculate: 4C2(.2^2)(.8)^2
Or Use a TI calculator 0r similarly a Casio fx-115 ES plus for:
binompdf(4, .2, 2)
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