Question 395385
let A=Marley is called during 3pm to 9pm
let B=Sarah calls someone during 6pm to 6:30pm
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Given P(A)=0.15
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P(B)=30/360 =1/12  since there are 30 minutes during the 6hours that he can be called.
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Need to know P(AnB)   if we assume A & B are independent
then P(AnB)=P(A)*P(B)=0.15*1/12=0.0125