Question
Amy has a cube numbered 1 through 6. If she rolls the cube 30 times, how many times can she expect to roll a multiple of 3?
Answers
MathMate
The multiples of 3 (between 1 and 6) are 3 and 6.
Since there are 6 faces in all, the probability of getting a multiple of 3 is 2/6=1/3.
So what is the expected number of times that she will roll a 3 or 6 out of 30 tosses?
Since there are 6 faces in all, the probability of getting a multiple of 3 is 2/6=1/3.
So what is the expected number of times that she will roll a 3 or 6 out of 30 tosses?