Chapter 4

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PercentsProbability Proportions Conversions Probs with Percents Wild Card

Find 44% of 600. A 100

264 A 100

What percent of 60 is 6? A 200

10% A 200

2 is what percent of 12? A 300

16.7% A 300

32 is 70% of what number? A 400

45.7 A 400

25% of what number is 10 A 500

40 A 500

You roll a number cube. Find P( number greater than 5) B 100

1/6 B 100

Find the P(even greater than 3) when rolling a number cube. B 200

1/3 B 200

In a batch of 850 calculators, 15 were found to be defective. What is the probability that a calculator chosen at random will be defective? Write the probability as a percent, rounding to the nearest tenth. B 300

15/850 = 1.8% B 300

Suppose you choose a marble from a bag containing 3 red marbles, 6 white marbles, and 1 blue marble. You return the first marble to the bag and then choose again. Find P(red and blue). B 400

3/100 B 400

You have seven $1 bills, two $5 bills, and three $10 bills in your wallet. You select a bill at random. Without replacing the bill, you choose a second bill at random. Find P($10 then $1). B 500

7/44 B 500

Solve. C 100

Solve. C 200

x = 6 C 200

A van travels 120 miles on 5 gallons of gas. Find how many gallons the van needs to travel 600 miles. C 300

25 gallons C 300

DAILY DOUBLE C 400 DAILY DOUBLE Place A Wager

The pair of figures is similar. Find x. C x

36/5 = 7 1/5 C 400

Human hair grows at a rte of about 0.33 mm per day. How much does it grow in 60 days? C 500

19.8 mm C 500

Write the conversion factor for seconds to minutes. Use the factor to convert 225 seconds to minutes. D 100

3.75 minutes D 100

A 16 oz bottle of water costs $1.32. What is the cost per ounce? D 200

$ per oz D 200

A boy makes 50 cents per day on his paper route. How much money will he make in a year? D 300

$ per year D 300

A scale of a blue-print is 1in to 4 ft. What are the actual dimensions of the bathroom which is 2in by 4in? D 400

8ft by 16ft D 400

Scale: 1in to 4ft Blueprint dimensions: 2in by 4in What is the actual area of the bathroom? D 500

128 ft 2 D 500

A cell phone company orders 300 new phones from a manufacturer. If the probability fo a phone being defective is 1.8%, predict how many of the phones are likely to be defective. Round to the nearest whole number. E 100

5

The art teachers at school planned to take 250 students on a field trip to an art museum. One teacher found that 5 of her 25 students could identify a painting by DaVinci before the field trip. What is the experimental probability that a student in the teacher’s class could identify a DaVinci painting. Write it as a percent rounded to the nearest tenth. E 200

1/5 = 20% E 200

Based on the P(students identifying the Da Vinci) = 20% from the previous question, how many of the 250 students would be able to identify the Da Vinci? E 300

50 E 300

Is this event independent or dependent? Explain. Toss a nickle and then toss a dime. E 400

Independent E 400

Are the two events dependent or independent? Explain. Pick a marble from a bowl of marbles. Keep the marble and pick another. E 500

Dependent E 500

Who is Ms. Cowan’s favorite team? F 100

Alabama Crimson Tide F 100

What is the best cheer ever? F 200

ROLL TIDE! F 200

The probability of the complement of an event is always less than the probability of the event itself; true or false? F 300

false F 300

If A and B are independent events and P(A) and P(B) are both greater than 1/2, then P(A and B) is never greater than 1; true or false? F 400

true F 400

The cross products of a proportion are never equal; true or false? F 500

false F 500

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