SOLUTION: There are 20 colored pencils in a box: 4 red, 5 green, 10 blue, and 1 black. You pick a pencil without looking. What is the sum of the probability of picking a red pencil and the p

Algebra ->  Probability-and-statistics -> SOLUTION: There are 20 colored pencils in a box: 4 red, 5 green, 10 blue, and 1 black. You pick a pencil without looking. What is the sum of the probability of picking a red pencil and the p      Log On


   

Question 1012854: There are 20 colored pencils in a box: 4 red, 5 green, 10 blue, and 1 black. You pick a pencil without looking. What is the sum of the probability of picking a red pencil and the probability of picking a black pencil?
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
Picking a red pencil.
P=4%2F20
P=1%2F5
Picking a black pencil.
P=1%2F20
The sum of those values is,
S=4%2F20%2B1%2F20=5%2F20=1%2F4