Chapter Study Guide and Review
480 Probability and PredictionsPredictions
Probability Experiments (Lesson 3A)
A number cube is
Number RolledTimes
17
29
310
412
56
66rolled. The table
shows the results of
the last 50 rolls.
Find each experimental
probability.- P(five)
- P(one or two)
- P(less than 6)
EXAMPLE 7 In an experiment, the same
two coins are tossed 50 times. Ten of those
times, tails was showing on both coins.
Find the experimental probability of
tossing two tails.
Since tails was showing 10 out of the
50 tries, the experimental probability is
_ 5010 or _^15.PSI: Act It Out (Lesson 3C)
Solve each problem. Use the act it out
strategy.- FAMILY PORTRAIT In how many ways can
the Maxwell family pose for a portrait if
Mr. and Mrs. Maxwell are sitting in the
middle and their three children are
standing behind them? - AMUSEMENT PARK In how many ways
can 4 friends be seated in 2 rows of
2 seats each on a roller coaster if Judy
and Mateo must ride together?
EXAMPLE 8 In how many ways can three
females and two males sit in a row of five
seats at a concert if the females must sit in
the first three seats?
Place five desks or chairs in a row. Have
three females and two males sit in any of the
seats as long as the females sit in the first
three seats. Continue rearranging until you
find all the possibilities. Record the results.
There are 12 possible arrangements.Lesson 3Compound Events
Independent and Dependent Events (Lesson 2B)
A bag of marbles contains 3 red, 4 blue,
and 2 yellow marbles, and 1 green marble.
Once selected, a marble is not replaced.
Find each probability.- P(2 yellow)
- P(red then blue)
- P(green then red)
- P(yellow then blue)
EXAMPLE 6 A spinner that is equally
divided into eight sections labeled 1–8 is
spun and a coin is tossed. What is the
probability of spinning an even number
and tossing heads?
P(spinning an even number) = _^12P(tossing heads) = _^1
2
P(even and heads) = _^12 · _^12 = _^14Lesson 2477_482_C08_SGR_895130.indd 480 12/29/09 1:31 PM