6th Grade Math Textbook, Progress

Find the odds in favor of and the odds against rolling

the given number of a 1–6 number cube.

9. a multiple of 3 10. an odd number 11.a factor of 5 12. not 4

Odds

Odds are a way of measuring the chance of success against the chance of failure.

Odds in favor of an event: Odds against an event:

Use the spinner to find the odds in favor of and the

odds against the spinner landing on an even number.

odds in favor of an even number
^23 

odds against an even number
^32 

number of unfavorable outcomes

number of favorable outcomes

number of favorable outcomes

number of unfavorable outcomes

2 favorable

outcomes: 2, 4

3 unfavorable

outcomes: 1, 3, 5

21

3

4

5

Use the table for exercises 15–16.

13. A bag contains the letters A, B, C,
    D, and E. A letter is picked from the
    bag at random. What are the odds
    in favor of picking a vowel?


14. Find the probability that a lightbulb
    will last less than 900 hours.


15. Predict how many lightbulbs out of
    500,000 will last longer than 899 hours.


16. Eve has a spinner with two colors, red and green. If the odds of spinning a green
    are ^12 , on which color is the spinner more likely to land, red or green? Explain.

14.Each guest will select a prize from a bag.

Of the 25 prizes, 12 are pens and 8 are

pencils. What are the odds against

selecting a pen or a pencil?

Life of Bulbs in Hours No. of Bulbs

600–699 102

700–799 95

800–899 108

900–999 195

Use the experimental results to predict how

many times you can expect to randomly

select the tile given the number of selections.

5. red tile, 60 times 6. green tile, 200 times


6. black tile, 150 times 8. blue tile, 700 times

Tiles Times Selected

Red 25

Black 20

Blue 22

Green 33

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