
Concept explainers
Find the expected number of times C will roll doubles with two number cubes in 90 trials.

Answer to Problem 4STP
J
Explanation of Solution
Formula Used:
If A and B are independent events ,
Calculation:
Rolling two dice at a time are both independent events.
The total number of outcomes =
We need doubles , so , the favourable number of outcomes = 6
And they are {(1,1) , (2,2) , (3,3) , (4,4) , (5,5) , (6,6)}
So, in 90 trials , C will roll doubles with two cubes =
Hence , option J is correct.
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