Name: _________________________________ Date: ____________
Theoretical Probability
SOL 6.20
THE GAMBLE
The chance of some event happening is called _________________ probability. You
can use a ratio to find probability. The probability of an event is a number from 0 to 1
(this includes 0 and 1). The closer a probability is to 1, the more likely it is to happen.
0
1
%
Fraction/Ratio
Decimal
Find the probability of an event.
A drawer contains 3 pairs of black socks, 4 pairs of blue socks, 2 pairs of brown
socks, and 1 pair of gray socks. Aubrey reaches into the drawer and pulls out 1
sock. What is the probability that the sock is blue? Express the answer as a
fraction, decimal, and percent.
Step 1 – Find the total number of possible outcomes. There are _______ socks in all.
Step 2 – Find the number of desired outcomes. There are _______ blue socks in all.
Step 3 – Find the probability.
Probability =
number of desired outcomes
total number of possible outcomes
The probability is
_______, _______, and _______