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probability

by mariah » Fri Jan 23, 2009 1:41 pm
53.On Saturday morning, Malachi will begin a camping vacation and he will return home at the end of the first day on which it rains. If on the first three days of the vacation the probability of rain on each day is 0.2, what is the probability that Malachi will return home at the end of the day on the following Monday?
A. 0.008
B. 0.128
C. 0.488
D. 0.512
E. 0.640
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by awesomeusername » Fri Jan 23, 2009 1:49 pm
I believe it will be:

Probability it doesn't rain on Sat * Probability it doesn't rain on Sunday * Probability it RAINS on Monday.

(0.8)(0.8)(0.2) = (0.64)(0.2) = 0.128
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by aroon7 » Fri Jan 23, 2009 5:08 pm
Yes it is B
what is the OA?
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by mariah » Wed Jan 28, 2009 2:59 pm
OA B
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