2008
Mathematics
JAMB
The result of rolling a fair die 150 times is as summarized in the table above. What is the probability of obtaining a 5
A.
3/10
B.
1/5
C.
1/6
D.
1/10
Correct Answer: 1/5
Explanation
Total possible outcome 12+18+x+30+2x+45 = 105+3x ∴105+3x = 150 3x = 150-105 3x = 45 x = 15 P(obtaining 5) = 2x/((105+3x)) Butx=15=(2(15))/((105+3(15)))=30/((105+45))=30/150=1/5
Total possible outcome 12+18+x+30+2x+45 = 105+3x ∴105+3x = 150 3x = 150-105 3x = 45 x = 15 P(obtaining 5) = 2x/((105+3x)) Butx=15=(2(15))/((105+3(15)))=30/((105+45))=30/150=1/5THIS WEEK's
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