The result of rolling a fair die 150 times is a... - JAMB Mathematics 2008 Question
A
3/10
B
1/5
C
1/6
D
1/10
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Correct Option: B
Total possible outcome
12+18+x+30+2x+45 = 105+3x
∴105+3x = 150
3x = 150-105
3x = 45
x = 15
P(obtaining 5) = (\frac{2x}{(105+3x)}But x= 15\
=\frac{2(15)}{(105+3(15))}\
=\frac{30}{(105+45)}\
=\frac{30}{150}\
=\frac{1}{5})
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