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28 Feb 2016, 09:44
Kudos
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D
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Difficulty:
5%
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Question Stats:
81% (00:52) correct
19%
(01:00)
wrong
based on 322
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If the probability of snow is the same every day this week, what is the probability of snow on Saturday?
(1) The probability of snow on Monday is 1/7.
(2) The probability having of no snow on both Thursday and Friday is 36/49.
(1) The probability of snow on Monday is 1/7.
(2) The probability having of no snow on both Thursday and Friday is 36/49.
28 Feb 2016, 19:06
Kudos
Bookmarks
Bunuel
Hi,
info :-
prob is the same each day
lets see the statements:-
(1) The probability of snow on Monday is 1/7.
straight forward. prob is the same every day, so on saturday too prob=1/7
Suff
(2) The probability having of no snow on both Thursday and Friday is 36/49.
let the Prob of snowing be x, so prob of not snowing= 1-x..
so on two days= (1-x)(1-x)=36/49..
(1-x)^2=(6/7)^2..
so 1-x==6/7 or -6/7..
but xcannot be>1,so 1-x=6/7
or x=1/7
Suff
D
05 Aug 2016, 05:24
Kudos
Bookmarks
Bunuel
From stimulus
P (Snow )= \(\frac{1}{7}\) (same on Sun, Mon, Tue, Wed, Thur, Fri, Sat)
P (No Snow)= \(\frac{6}{7} (\)same on Sun, Mon, Tue, Wed, Thur, Fri, Sat)
AIM :- FIND P(Snow) on Saturday
(1) The probability of snow on Monday is\(\frac{1}{7}\)
Since P(Snow) on Monday = P (Snow) on Saturday
So P(Snow) on Saturday = \(\frac{1}{7}\)
SUFFICIENT
(2) The probability having of no snow on both Thursday and Friday is \(\frac{36}{49}\)
We know from Stimulus that P (No snow) on Thursday= P (No Snow) on Friday
therefore P (No Snow) Thursday and P(No Snow)Friday \(= \frac{36}{49} = \frac{6}{7}*\frac{6}{7}\)
Therefore P (Snow) on thursday or friday or saturday (since it is same)\(= 1-\frac{6}{7} = \frac{1}{7}\)
SUFFICIENT
ANSWER IS D
