Question

Choose a number at random from 21 to 40. what is the probability that the number chosen is even

Answer 1

The probability of the number being even would be 50%

fraction:
`(1)/(2)` decimal:
`0.5`

Explanation:

First you have to look at the amount of odd and even numbers you have:

Even:
`22,24,26,28,30,32,34,36,38,40`

Odd:
`21,23,25,27,29,31,33,35,37,39`

Once you know that, count the amount of each number you have:

Even:
`10`

Odd:
`10`

You can then take the value you want to know and put it as the numerator of a fraction (top value).

Add the two values you have [
`10+10=20` ] and put that as the denominator of the same fraction (bottom value).

You will be left with this:

Fraction:
`(10)/(20)`

SIMPLIFY:
`(1)/(2)`

Then put it in whatever form you want :)

decimal:
`0.5` fraction:
`(1)/(2)` percent:
`50`%

hope this helps you! :))