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zheka24 [161]
3 years ago
12

Find P(not rolling 1, 3, 4, or 5) with one number cube.

Mathematics
1 answer:
Varvara68 [4.7K]3 years ago
6 0

The event "not rolling 1, 3, 4, or 5" is the same event as "rolling 2 or 6".

Since the possible outcomes of a number cube have the same probability, the probability of rolling 2 or 6 is given by

\dfrac{\text{\# of good outcomes}}{\text{\# of possible outcomes}}=\dfrac{2}{6}=\dfrac{1}{3}

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In the question, it is already given that the total number of runners in the race is 60 and out of them 1/3 dropped out in the first half. In the second half 1/4 of the remaining runners dropped out.
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Total number of runners in the race = 60
Number of runners that dropped out in the first half = 1/3 * 60
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Then 30 runners completed the race.
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