Question

Addison has a bag of 25 colored pens. There are 9 blue, 5 red, 7 black, and 4 green. Addison will pick a pen from the bag, without looking, record the color and put it back in the bag. If Addison does this 200 times, about how many time scan she expects to pick a blue pen?

show all work,

Answer 1

C

Explanation:

There are 9 blue, 5 red, 7 black, and 4 green pens, 25 colored pens in total.

Use the definition of probability:

`P=\frac{\text{Number of favorable outcomes}}{\text{Number of all possible outcomes}}`

Find the probability to choose blue pen:

Number of all favorable outcomes = 9

Number of all possible outcomes = 25

`P(\text{Blue pen})=(9)/(25)=0.36`

Hence, Addison can expect to pick a blue pen

`200\cdot 0.36=72` times