An -sided die
Probability
Level
2
Jorge has an -sided fair die and wonders how many times he would need to roll it until he has rolled all the numbers from to (in any order).
He does a quick calculation and discovers that the expected value for the number of rolls is 91 when rounding to the nearest integer.
How many sides does his die have?
Clarification: One distinct number from to is printed on each face of the die.
Image credit: ravnerdwars.info
Other Expected Value Quizzes
by
Geoff Pilling