A batsman's runs in 80 one day matches are as follows:
Runs 20-29 30-39 40-49 50-59 60-69 70-79 80-89 90-99.
N0 of Matches 1 1 8 13 20 22 12 3.
What is the probability that in the the next match the batsman will score :
(a) at least 70 runs
(b) at most 69 runs
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Answers

2015-03-07T15:27:23+05:30
A]  P=37/80
b] P=43/80

a] at least 70 means he may score above it that is 70-79 80-89 90-99 
that is 22+12+3=37
b] at most 70 means not above 70 but may be less 70 so 1+1+8+13+20=43 
hope it helped .....
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