Chapter 9 Probability Worksheet Page 31
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48Theoretical and experimental probability can be used to make
predictions about future events.
Predict Future Events
4
MEDIA
A media buyer examines last year’s
DVDs Sold
DVD sales to decide how many DVDs of
Type
Number
each type to buy this year. Last year’s
action
670
sales are shown in the table. What is the
comedy
580
probability that a person buys a comedy
drama
450
DVD?
horror
300
There were 2,000 DVDs sold and 580 chose
Real-World Career
_
_
580
29
comedy. So, the probability is
or
.
How Does a Media
2,000
100
Buyer Use Math? A
5
Suppose the media buyer expects to sell 5,000 DVDs this year.
media buyer looks at
previous sales to make
How many drama DVDs should she buy?
predictions on how
_
_
450
x
many items to buy in
=
Write a proportion.
the future.
2,000
5,000
450 · 5,000 = 2,000 · x
Find the cross products.
Math Online
2,250,000 = 2,000x
Multiply.
For more information,
go to
.
1,125 = x
Divide each side by 2,000.
She should buy about 1,125 drama DVDs.
What is the probability that a person buys a horror DVD?
e.
If the media buyer expects to sell 3,000 DVDs this year, about how
f.
many action movies should she buy?
Examples 1–3
For Exercises 1–3, a coin is tossed 50 times, and it lands on heads 28 times.
(p. 487)
Find the experimental probability of the coin landing heads.
1.
Find the theoretical probability of the coin landing heads.
2.
Compare the probabilities in Exercises 1 and 2.
3.
FOOD
For Exercises 4 and 5, use the table showing the
Number
Muffin
types of muffins that customers bought one morning
of People
from their local bakery.
blueberry
22
Example 4
What is the probability that a customer buys a
4.
poppyseed
17
(p. 488)
blueberry muffin?
banana
11
If 100 customers buy muffins tomorrow, about
5.
how many would you expect to buy a banana
muffin?
488
Chapter 9 Probability
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