7th Grade Math

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Another way to describe the chance of an event occurring is with odds. The

odds in favor of an event is a ratio that compares the number of ways the event

can occur to the number of ways that the event cannot occur.

Suppose you want to find the odds in favor of rolling a 5 or 6 on a

number cube.

2:4 or 1:2

So, the odds in favor of rolling a 5 or 6 is 1:2.

23. A letter from the alphabet is chosen at random. Find the odds in favor of
    picking an A, E, U, or O.

2 ways to occur: 5, 6 4 ways to not occur: 1, 2, 3, 4

Lesson 1B Probability 439

20. Mr. Zajac will choose one student from
    each of the two groups below to present
    their history report to the class.

Group 1

Ava

Antoine

Greg

Group 2

Mario

Brooke

Which set shows all the possible

choices?

A. {(Ava, Mario), (Antoine, Mario),

(Greg, Mario)}

B. {(Ava, Antoine), (Antoine, Greg),

(Brooke, Mario)}

C. {(Ava, Mario), (Antoine, Mario),

(Greg, Mario), (Ava, Brooke),

(Antoine, Brooke), (Greg, Brooke)}

D. {(Brooke, Antoine), (Mario, Greg),

(Ava, Brooke), (Mario, Antoine)}

21. GRIDDED RESPONSE A coffee shop
    offers 2 types of coffee: regular and
    decaffeinated; 3 types of flavoring:
    vanilla, hazelnut, and caramel; and
    2 choices of topping: with or without
    whipped cream. How many possible
    choices are there?
    22. SHORT RESPONSE Miranda needs to
    get dressed (D), brush her teeth (T), pack
    her lunch (L), and make her bed (B)
    before she leaves for school.

FRENCLiteratureH

She always makes her bed right after she

packs her lunch. List all the different

combinations of tasks Miranda could do.

Use the given letters of each task in your

list (D, T, L, B).

429_439_C08_L1_895130.indd 439 12/29/09 1:20 PM