Question

If Matthew rolls a number cube 90 times, how many times can he expect it 2 poilto land on an odd number?

Answer 1

The total face of a cube is 6

Possible odd 1,3,5

`Probability\text{ =}\frac{Possible\text{ outcome}}{Total\text{ outcome}}`

The cube is numbered one through six, and the odd numbers are therefore 1,3,5. So the probability of rolling an odd number in any given single roll is

`(3)/(6)=(1)/(2)`

Multiplying this probability by the number of times she rolls the cube gives

`(1)/(2)*90=45`

The final answer

`45`