Question

WILL MEDAL AND FAN

(06.02)A bag contains 30 marbles, 3 of which are blue, 20 are red, 5 are green, and 2 are purple. Emerson takes a marble out of the bag, records the color, and returns it to the bag. How many purple marbles should he expect after 300 trials?

20
30
50
200

Answer 1

@Hero @Preetha

Answer 2

anybody?

Answer 3

@nerlineg

Answer 4

On any draw, what is the probability of choosing a purple marble?

Answer 5

idk, but i think it is 20

Answer 6

How many purple marbles are there?

Answer 7

The probability of drawing a purple marble is 2/30 on each trial.
The expected number of purple marbles after 300 trials is therefore
\[\large \frac{2}{30}\times\frac{300}{1}=?\]

Answer 8

i think so because all of the marbles added up = 30, and 30 x 10 = 300

Answer 9

2 x 10 = 20

Answer 10

Correct.

Answer 11

and 600/30

Answer 12

so it is 20?

Answer 13

Yes.

Answer 14

thank u!

Answer 15

you're welcome :)