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Harlene tosses two number cubes. If a sum of 8 or 12 comes up, she gets 9 points. If not, she loses 2 points. What is the expected value of the number of points for one roll?

Harlene tosses two number cubes. If a sum of 8 or 12 comes up, she gets 9 points. If not, she loses 2 points. What is the expected value of the number of points for one roll?
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5 votes
Harlene tosses two number cubes. If a sum of 8 or 12 comes up, she gets 9 points. If not, she loses 2 points. What is the expected value of the number of points for one roll?

asked
User Noiseymur
by
8.3k points

2 Answers

3 votes

Answer:

Answer:

-1/6

answered
User Toufic Batache
by
7.9k points
1 vote
8 + 12 + 20
20 - 9 = 11
11 - 2 = 9

Hope this helps! :)
answered
User Nanne
by
8.3k points
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