The result of rolling a fair die 150 times is as summariz...
The result of rolling a fair die 150 times is as summarized in the table above. What is the probability of obtaining a 5?
3/10
1/5
1/6
1/10
Correct answer is 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) = 2x(105+3x)Butx=15=2(15)(105+3(15))=30(105+45)=30150=15
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