Question
Fri November 11, 2011 By:

What is the probality that a non leap year, selected at random will contain 53 Sundays.

Expert Reply
Sat November 12, 2011
A non leap year has 365 days which means
 
365 = 52weeks + 1 day
 
Now there will be always 52 sundays but for 53 sundays the extra day must be 
a sunday.
 
We have 7 different days, so the extra day can be anything out of
these 7 days.
 
So, out of these 7 days each day is having a probability of 1/7
 
So, is the sunday.
 
Hence the probability that it will have 53 sundays is 1/7.
 
Thank you
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