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Brent rolls a fair dodecahedral die with numbers 1,2,3,...,11,12 on its faces. What is the expected number he obtains? Express your answer in a decimal.

 Apr 17, 2021
 #1
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9 sides have 1 digit (1, 2, 3, ..., 9) and 3 sides have 2 digits (10, 11, 12)

Total number of digits:  1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 2 + 2 + 2  =  15

Divide this value by the number of sides:

15 /12  =  1.25

 

Hope this helped~Hannah

 Apr 17, 2021
 #2
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That answer is wrong.

Guest Apr 17, 2021
 #4
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I know the answer is wrong 

But so is depression~Hannah

Guest Apr 17, 2021
 #3
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Sum of the faces    1 + 2 + 3......+ 12 = 78

 

78/12 = 6.5

 Apr 17, 2021

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