A manufacturer fills an order for 4,200 smart phones. The quality inspector selects a random sample of 60 phones and finds that 4 are defective. How many smart phones in the order are likely to be defective?

There are 600 students at Hilda’s school. Out of 30 students she surveys, 8 of them ride their bikes to school. Estimate how many students ride their bikes to school from the population.

A random sample of dogs at different animal shelters shows that 12 of 60 dogs are puppies. The cities shelters collectively house 1,200 dogs each year. Estimate how many are puppies.

A bag contains:

• 5 red marbles

• 6 blue marbles

• 3 green marbles

• 4 black marbles

• 2 yellow marbles

A marble will be drawn from the bag and replaced 200 times. What is a reasonable prediction for the number of times a yellow or green marble will be drawn?

A store manager selects 30 cartons of eggs and finds 4 cartons that have cracked eggs. If the store has 105 cartons of eggs, how many cartons can she expect to have cracked eggs in them?

Part of the population of 4,500 elk at a wildlife preserve is infected with a parasite. A random sample of 50 elk shows that 8 of them are infected. How many elk are likely to be infected?

In a game, the probability of winning is 1 out of 5. How many times could Lisa expect to win if she plays the game 85 times?

Jason has two number cubes, labeled 1 through 6. This gives him 36 total possibilities. He will roll the cubes 300 times and then add the results after each roll. About how many times should Jason roll a sum of 5?

Hint: A sum of 5 is (1,4) (2,3) (3,2) (1,4)

A coin was tossed 80 times, out of which it landed on heads 60 times. What percent is this, out of 100?

Susan has a number cube labeled 1 to 6. She will roll the cube 100 times. How many times could Susan expect to roll an even number?

Kris has a bag that contains only red marbles, green marbles, and purple marbles. Kris pulls a marble from the bag, records the color of the marble and puts it back in the bag. She performs 25 pulls and draws 8 red marbles, 12 green marbles, and 5 purple marbles. Based on the data, about how many times would Kris pull a red marble if she performed 1,000 pulls?

Robert will roll a number cube, labeled 1 through 6, a total of 200 times. About how many times could Robert expect to roll a number greater than 4?

Kaitlyn has 7 white chips, 5 red chips, and 8 blue chips in a bag. Without looking, Kaitlyn pulls a chip out, records the color, and puts it back in the bag. She does this 200 times. About how many times could Kaitlyn expect to pull out a blue chip?

Fred will spin the spinner below 150 times. About how many times could Fred expect the spinner to land on blue?

Your scale is 1 inch to 5 miles. If the drawing shows a road that is 2 inches long, how many miles is the actual road?

Scale: 1in.=7ft. The actual width of the backyard is 49 ft, how wide is it in the drawing?

A scale drawing of a rectangular park is 5 inches wide and 7 inches long. The actual park is 280 yards long. How wide is the actual park?

what is the length of x?

what is the length of x?

Kolton can mow 3/8 of an acre of grass in 3/4 an hour. How many acres of grass does Kolton mow per hour?

Jashon's pet snail can move 3/10 of a meter every 1/12 hour, what is the speed of the snail, in meters per hour?

Saniyah drank 1/4 of a milkshake in 1/10 of an hour. How long will it take her to drink a whole milk shake?

Johan plays 1/3 of a song in 1/4 of a minute. How many minutes will he need to play a full song?

Solve this proportion:

Solve this proportion:

$$\frac{7}{3}=\frac{4}{t}$$  

$$\frac{12}{5}=\frac{5}{n}$$