Brent rolls a fair dodecahedral die with numbers $1,2,3,...,12$ on its faces. What is the expected number of digits in the number he obtains? Express your answer in a decimal.
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
Thank you so much geno!!!
Nice, geno.....!!!!
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