Question

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Carl puts 100 marbles in a bag. He asks
Kelley to draw a marble without looking,
record the color, and then return the marble
to the bag. Kelley repeats the trial 20 times,
recording 8 blue and 12 red marbles. Based
on these results, predict how many marbles
are red if the bag contains only red and blue
marbles.
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Answer 1

Out of 100 marbles, the number of blue marbles = 40 and the number of red mabrles = 60.

Explanation:

Carl asks Kelley to draw a marble without looking, record the color, and then return the marble to the bag. Kelley repeats the trial 20 times,

The number of blue marbles = 8

The number of red marbles = 12

The probability of blue marbles in the bag =
`((8)/(20) )100` = 40%

The probability of red marbles in the bag =
`((12)/(20) )100` = 60%

Since the total number of marbles is 100,

The number of blue marbles = 40% = 40.

The number of red mabrles = 60% = 60.