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Scoretop 22 - Question 11

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by akay » Tue Sep 18, 2007 8:04 pm
A probability question that has me foxed

On Saturday morning, Malachi will being 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 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 samirpandeyit62 » Tue Sep 18, 2007 9:01 pm
Probabilty that he returns on monday is

P(no rain on Sat) X p(no rain on Sun) X p(rains on monday)

now P of no rain is 1-.2 =.8

so it is

.8 X .8 X.2

=0.128

so ans should be B
Regards
Samir
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by kajcha » Wed Sep 19, 2007 2:43 am
Agree E
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