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Without looking, Tammy takes a marble
out of a bag that contains 10 red
marbles, 15 green marbles, and 25. blue
marbles. She records its color and
returns the marble to the bag. If Tammy
repeats this process 90 times, how many
times can she expect to pull out a red
marble?

Respuesta :

Answer:

18

Step-by-step explanation:

fichoh

Using the concept of probability. the expected number of red picks from 90 is 18 red marbles.

Recall :

  • Probability = Required outcome / Total possible outcomes

The total Number of marbles = (10+15+25) = 50 marbles

Probability of randomly picking a red marble :

  • P(red) = 10 / 50 = 1/5 = 0.2

Number of red marbles that can be picked from 90 selections:

  • P(red) × 90

Number of red marbles = 90 × 0.2 = 18 marbles

Hence, 18 red marbles.

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