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Proportions Word Problems
Compound Events
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Counting Strategies
100
A science teacher chose a girl to pass out tests to the class. If there are 35 students in the class and the probability of choosing a girl is 4/7, how many girls are in the class?
What is 20?
100

Luis has a bag of 2 blue marbles and 2 yellow marbles but in his experiment, he draws blue 3 times and yellow 7 times. Which explains why his results are so different from the theoretical probablitiy? A)the number of trials is low B) Luis recorded the results incorrectly C)some of the marbles are stuck to the fabric of the bag D)Luis did not reach far enough into the bag

What is A) the number of trials is low

100

Randall spins a spinner evenly divided into four sections numbered 1,2,3, and 4. If he spins it twice, what is the probability of getting a sum that is greater than 4?

What is 10/16 or 5/8?

100

Which statement comparing experimental and theoretical probabilities is true? A) The experimental probability of a family with 3 boys will always be equal to the theoretical probability of a family with 3 boys B)The experimental prob. of a family with 3 boys may be less than the theoretical probability of a family with 3 boys, or C) The experimental probability of a family with 3 boys will always be different from the theoretical prb. of a family with 3 boys

What is B) The experimental probability of a family with 3 boys may be less than the theoretical probability of a family with 3 boys

100

If 6 soccer teams play each other once, how many games are played?

What is 15?

200
Suppose Joe rolls a 6 sided number cube. If the probability of rolling a number less than 5 is 2/3, what is the best prediction of the number of times Joe will roll less than 5 if he rolls the cube 150 times?
What is 100?
200
Bob rolls a fair die and flips a fair coin, what is the probability he will land on an even number and heads?
What is 6/12 or 1/2?
200

If Sally has 5 pairs of pants, shirts colored red, green, blue, and pink, and shoes that are black or brown, how many outfits can she make?

What is 40?

200

There were 5 blue marbles and 5 red marbles in a bag. When I draw 10 times, I get 8 blue and 2 red. I know my results are a little off from my theoretical probability. What should I do?

What is conduct more trials?

200

There are 16 teams participating in a basketball tournament. Once a team loses 1 game, the team is eliminated. The winner of each game advances to the next round to play the winner of another game. How many games must be played in all to determine a champion team?

What is 15?

300
At Frank's Furniture Store, the ratio of sales of living room furniture to bedroom furniture is 3 to 2. If 184 bedroom sets were sold last year, what is the best prediction for the number of living room sets sold last year?
What is 276?
300
The probability of choosing a red four from a deck of cards followed by a spade without replacement?
What is 1/102?
300

If I roll 2 fair number cubes, what is the probability I will get a product of more than 20?

What is 6/36 or 1/6?

300

If the weather report calls for a 20% chance of rain, this is the probability it will not rain?

What is 80%?

300
Five contestants enter the spelling bee. In how many different orders can they take their turn?
What is 120?
400

If I roll two fair die 144 times, predict how many times I will roll a sum less than 5.

What is 24?

400

If you rolled 2 number cubes, what is the probability of rolling a 6 on one and an even number on the other?

What is 1/12?

400

In a bag of 20 marbles colored black, red, blue, and yellow, 80% of the marbles are black, red, or blue. How many marbles yellow? (not the percent)

What is 4?

400

There is a .3 chance of rain on Monday and .5 chance of rain on Tuesday. What is the probability it will rain on Monday and Tuesday?

What is 15%?

400
Six friends want to play a game but the game only allows four players. In how many ways can the friends play the game?
What is 360?
500

After flipping 3 coins 120 times, what is the prediction for landing on 2 heads and 1 tails?

What is 45?

500

A rectangular dart board measures 14 mm by 10 mm. There is a shaded circle with a diameter of 6 mm inside the rectangle. What is the approximate probability of landing in the shaded circle?

What is 1/5 or .2 or 20%?

500
Which sample is not a good survey? A) favorite flower asked at a mall, B)favorite hobby asked at a model train store, C)favorite holiday at a fast-food restaurant, or D)favorite sport asked at a library
What is B) favorite hobby asked at a model train store?
500

The ratio for finding the theoretical probability of an event.

What is Probability=favorable outcome/total outcomes?

500
Members of the art club are painting a wall in the lunchroom. They are making a design with 3 rows of stripes. The first row has 6 inch stripes, the second row has 8 inch stripes, and the third row has 12 inch stripes. At what length will the lines meet?
What is 24?