Question

A jar contains 30 red marbles, 50 blue marbles and 20 white marbles.You pick one marble from the jar at random. Find each theoretical probability.

(a) P (red)

(b) P (not white)

Answer 1

There’s 100 total marbles, 30 being red. That would be 30/100 chance. Simplify it to get the lowest you can.
a. 3/10
There’s 20 white marbles. Subtract that from 100 to get your answer, 80/100. Simplify.
b.8/10

Answer 2

Answer:a =
`(3)/(10)` , b =
`(4)/(5)`

Explanation:

P(red) =
`(red (marbles))/(total(marbles))`

=
`(30)/(30+50+20)`

=
`(30)/(100)`

=
`(3)/(10)` simplified

P(not white) =
`(red + blue(marbles))/(total(marbles))`

=
`(30+50)/(30+50+20)`

=
`(80)/(100)`

=
`(4)/(5)` simplified