The probability of first choosing a gel pen is 10 out of 20, or 1/2. After replacing it, the probability of choosing a fountain pen is 4 out of 20, or 1/5. Therefore, the overall probability is:
1/2 * 1/5 = 1/10
So, the correct answer is Start Fraction 1 over 10 End Fraction.
A desk drawer has 20 pens: 4 fountain pens, 10 gel pens, and 6 ballpoint pens. What is the probability of randomly choosing a gel pen, replacing it, and then choosing a fountain pen?(1 point)
Responses
110
Start Fraction 1 over 10 End Fraction
12
Start Fraction 1 over 2 End Fraction
710
Start Fraction 7 over 10 End Fraction
15
1 answer