Question

A number cube has sides labeled 1 to 6. Hannah rolls the number cube 18 times. How many times can she expect to roll a number less than 3?

A.6
B.8
C.2
D.3

Answer 1

The answer is 6. Hope it helps

Answer 2

6

Explanation:

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