1. EXAMPLE 3
Find odds
A card is drawn from a standard deck of 52 cards. Find (a) the odds in favor of drawing a 10 and (b) the odds against drawing a club.
SOLUTION
Odds in favor of drawing a 10
Number of non-tens =
Number of tens = 4 48 = 1 12
, or 1:12

2. EXAMPLE 3
Find odds
Odds against drawing a club
Number of clubs =
Number of non-clubs = 39 13 = 3 1
, or 3:1

3. EXAMPLE 4
Find an experimental probability
Survey
The bar graph shows how old adults in a survey would choose to be if they could choose any age. Find the experimental probability that a randomly selected adult would prefer to be at least 40 years old.

4. EXAMPLE 4
Find an experimental probability
SOLUTION
The total number of people surveyed is:
= 3516
Of those surveyed, = 1089 would prefer to be at least 40.
1089
3516
P(at least 40 years old) =
0.310

5. GUIDED PRACTICE
for Examples 3 and 4
A card is randomly drawn from a standard deck. Find the indicated odds.
In favor of drawing a heart
SOLUTION
Number of non-hearts =
Number of hearts = 13 39 = 1 3
ANSWER 1 3

6. GUIDED PRACTICE
for Examples 3 and 4
A card is randomly drawn from a standard deck. Find the indicated odds.
Against drawing a queen
SOLUTION
Number of queens =
Number of non-queens = 48 4 = 12 1
ANSWER 12 1

7. GUIDED PRACTICE
for Examples 3 and 4
A card is randomly drawn from a standard deck. Find the indicated odds.
What If? In Example 4, what is the experimental probability that an adult would prefer to be (a) at most 39 years old and (b) at least 30 years old?
a = 2427
b = 1968
2427
3516
1968
3516
= 0.69
= 0.56
ANSWER
a. about 0.69
b. about 0.56