A number cube has sides labeled 1 to 6.

Question

Hannah rolls the number cube 18 times.
How many times can she expect to roll a
number less than 3?
A2 C6
B3 D8

Answer 1

The expected value is the number of rolls multiplied by the probability of each success on the roll (as success is the top face of the die is a 2 or a 1) and the probability of that success is 2/6 which reduces to 1/3
So the expected value in 18 rolls
= 18 x 1/3

Answer 2

the answer is A

Answer 3

the answer is 6 or C I had the same exact question and I got it right.