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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.

 Sep 13, 2021
 #1
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With one roll of a fair 12-sided die, the probability of any one number appearing is EQUALLY likely:

 

Therefore, the probability is 1 / 12

 Sep 13, 2021
 #2
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1+2+3+4+5.....+12 =   78

 

 78/12 = 6.5

 Sep 13, 2021

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