Question

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?

Answer 1

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 2

The probability of drawing a purple marble is found from:
\[\large P(purple)=\frac{number\ of\ purple\ marbles}{toal\ number\ of\ marbles}=you\ can\ calculate\]
The expected number of purple marbles after 300 trials is then given by:
\[\large P(purple) \times 300=you\ can\ calculate\]

Answer 3

Is it 20?