Question

If you have five red balls and five blue balls in a jar what’s the probability of the first ball being red?

Answer 1

Explanation:

Total number of red balls = 5

Total number of blue balls = 5

Total number of balls in jar = 5 + 5

= 10

Probability of the first ball being red = total number of the red ball/total number of balls in the jar

=
`(5)/(10)`

=
`(1)/(2)`

Therefore, the probability of the first ball being red =
`(1)/(2)`, 50% or 0.5 (in any way you are instructed to write it in)

Answer 2

red balls = 5

blue balls = 5

total balls = 5 blue+5 red

= 10

`p(first \: ball \: being \: red) = (red \: balls)/(total \: balls)`

`p(first \: ball \: being \: red) = (5)/(10) = (1)/(2)`