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 = $\frac{3}{10}$ , b =  $\frac{4}{5}$

Step-by-step explanation:

P(red) = $\frac{red (marbles)}{total(marbles)}$

          = $\frac{30}{30+50+20}$

          = $\frac{30}{100}$

          = $\frac{3}{10}$      simplified

P(not white) = $\frac{red + blue(marbles)}{total(marbles)}$

                    = $\frac{30+50}{30+50+20}$

                    = $\frac{80}{100}$

                    = $\frac{4}{5}$      simplified