Predictions Using Probability

The following table shows the results of a

survey in which 50 people were asked to name

their favorite sport.

Based on these results, how many people out of

1000 would you expect to pick tennis?

A grocery store sold a total of 300 snack

chips last week as follows: Potato Chips, 135;

Corn chips, 115; Cheese Puffs, 35; and

Pretzels, 15. The store’s owner plans to place

an order for 1,000 bags of the same kind of

chips for a holiday weekend rush. Based on last

week’s sales, how many bags of pretzels should

he order?

• 50

• 500

• 5

• 150

Tom solved 9 out of the 15 practice

questions for a test correctly. If the actual test is

35 questions, how many can Tom expect to

solve correctly?

• 18

• 21

• 23

• 1,000

An inspector at a calculator factory found 3

out of 100 calculators did not work properly. If

the factory produces an order of 5000

calculators, how many might be expected to not

work properly?

• 15

• 30

• 150

• 300

If 1 out of every 5 Americans ride to work

with a carpool, how many people out of 2,000

would be expected to carpool?

Suppose you spin the spinner 600 times.

Predict the number of times the spinner will

land on 500.

• 30

• 42

• 10,000

• 125

A survey of 800 residents in a town of

10,000 people were asked about their favorite

ice cream Favorite Flavor. The results are

summarized below.

Based on this survey, how many of the town’s

10,000 people would prefer Strawberry?

• 2,075

• 11,945

• 166

• 800

An envelope contains 10 colored cards. Jim reached in, pulled out a card, recorded the color, and put the card back. He did this 50 times. Here are his results. Based on these results, what is the best prediction as to the number of green cards in the envelope?

You toss a coin 50 times. You get “heads”

20 times. What is the experimental probability

that the next time you toss the coin, it will give

you “heads’?

• 1/20

• 1/2

• 2/5

• 1/5

The graph shows results of a survey of 120

cat owners to determine which brand of cat

food their cats liked best. Use the graph to

answer the question below.

If a store sells 5000 cans of cat food, how

many would you expect to be Brand C?

• 125

• 30

• 300

• 1,250