Predict about a whole group from a sample

Answer Key - Grade 7 Math Worksheet

Circle the best answer, or write your answer on the line.

1. 1.

   Esme asked a random sample of 20 of the 500 students if they play an instrument. 8 said yes. One kazoo was mentioned. About how many of the 500 students play an instrument?

   200
2. 2.

   Noah asked a random sample of 30 of the 450 students if they ride the bus. 9 said yes. The bus stayed on time. About how many of the 450 students ride the bus?

   135

3. Read this first

   Use this

   Each dot is one student.

4. 3.

   Ari asked a random sample of 40 of the 600 students if they bring a lunch from home. 15 said yes. About how many of the 600 students bring a lunch from home?

   225
5. 4.

   Luz asked a random sample of 35 of the 560 students if they have a pet dog. 14 said yes. Several tails wagged. About how many of the 560 students have a pet dog?

   224
6. 5.

   Jun asked a random sample of 6 of the 140 students about minutes of practice a day. The drum stayed polite. About how many minutes in all would the 140 students have?

   3430
7. 6.

   Pia asked a random sample of 8 of the 90 students about glasses of water drunk in a day. The water bottle was proud. About how many glasses in all would the 90 students have?

   585
8. 7.

   Bo asked a random sample of 6 of the 110 students about star stickers traded this month. Glitter appeared anyway. About how many star stickers in all would the 110 students have?

   1650
9. 8.

   Milo took six random samples of 10 students from 300 students. The sample cards stayed in order. How far apart are the highest and the lowest sample mean?

   8
10. 9.

    Zee took six random samples of 10 students from 240 students. One pencil stayed sharp. How far apart are the highest and the lowest sample mean?

    11
11. 10.

    Kira took six random samples of 10 students from 420 students. A rope tied itself in a bow. How far apart are the highest and the lowest sample mean?

    15