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.
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
1+2+3+4+5.....+12 = 78
78/12 = 6.5
