Question 462187: 1.Mr. A has a career batting average of .325. What was the probability that would get at least one hit in five official times at bat?
2.A factory finds that on the average 20% of the bolts produced by a given machine will be defective for certain specified requirements. If 10 bolts are selected at random from the days production of this machine, find the probability that 2 or more will be defective.
Answer by stanbon(75887)   (Show Source):
You can put this solution on YOUR website! 1.Mr. A has a career batting average of .325. What was the probability that would get at least one hit in five official times at bat?
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P(x>=1) = 1 - P(x=0) = 1 - (0.675)^5 = 1-0.1401 = 0.8599
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2.A factory finds that on the average 20% of the bolts produced by a given machine will be defective for certain specified requirements. If 10 bolts are selected at random from the days production of this machine, find the probability that 2 or more will be defective.
P(2<-x<=10) = 1 - P(0<= x <=1) = binomcdf(10,0.2,1) = 0.6242
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Cheers,
Stan H.
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