Explanation:
To find the probability of picking a black pen, we need to determine the number of black pens in relation to the total number of pens in the drawer.
Given:
Total number of pens = 80
Number of black pens = 15
The probability of picking a black pen can be calculated by dividing the number of black pens by the total number of pens:
Probability of picking a black pen = Number of black pens / Total number of pens
Probability of picking a black pen = 15 / 80
Probability of picking a black pen = 0.1875 or 18.75%
Therefore, the probability that Evelyn picks a black pen is 0.1875 or 18.75%.
To find the probability of picking a blue pen, we can subtract the probability of picking a black pen from 1, since there are only black and blue pens in the drawer:
Probability of picking a blue pen = 1 - Probability of picking a black pen
Probability of picking a blue pen = 1 - 0.1875
Probability of picking a blue pen = 0.8125 or 81.25%
Therefore, the probability that Evelyn picks a blue pen is 0.8125 or 81.25%.