Predict about a whole group from a sample

Answer Key - Grade 7 Math Worksheet - Building Confidence

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

1. 1.

   Each dot is one student. Esme asked a random sample of 20 of the 300 students. One sneaker squeaked. Each dot in the sample stands for how many students in the whole group?

   15
2. 2.

   Noah asked a random sample of 30 of the 240 students. A rocket was rumored. Each dot in the sample stands for how many students in the whole group?

   8
3. 3.

   Luz asked a random sample of 25 of the 200 students. One kazoo was mentioned. Each dot in the sample stands for how many students in the whole group?

   8
4. 4.

   Each dot is one student. Each dot stands for 16 students in the whole group. Tala asked a random sample of 25 of the 400 students. A bell rang twice. About how many of the 400 students own a bike?

   128
5. 5.

   Jun asked a random sample of 30 of the 150 students. Nobody read the survey upside down. About how many of the 150 students read a book yesterday?

   55
6. 6.

   Bo asked a random sample of 20 of the 320 students. The oranges stayed calm. About how many of the 320 students prefer apples to oranges?

   96
7. 7.

   Milo asked a random sample of 6 of the 90 students about books read this month. A bookmark was lost twice. About how many books in all would the 90 students have?

   450
8. 8.

   Zee asked a random sample of 6 of the 120 students about minutes of reading a night. The lamp stayed on. About how many minutes in all would the 120 students have?

   3600
9. 9.

   Kira asked a random sample of 8 of the 150 students about cans collected for the food drive. One can rolled away. About how many cans in all would the 150 students have?

   1050
10. 10.

    Ren asked a random sample of 6 of the 80 students about miles biked this week. A helmet wore a sticker. About how many miles in all would the 80 students have?

    960