Common Core 7.SP.A.2 worksheet

Question 1

Scientists tag 26 fish in a lake and release them. Later they catch 50 fish and 5 are tagged. Estimate the number of fish in the lake (nearest whole number).

Answer 

Question 2

A survey is planned by asking only the members of the football team about favourite sports. Is this likely to give a fair (unbiased) sample?

• A. Yes
• B. No, it is biased

Question 3

In a random sample of 50 students, 6 said they walk to school. There are 1600 students in the school. Estimate how many walk to school.

Answer 

Question 4

In a random sample of 20 students, 6 walk or cycle to school. Predict how many of the school's 280 students walk or cycle to school.

Answer 

Question 5

Scientists tag 32 fish in a lake and release them. Later they catch 80 fish and 7 are tagged. Estimate the number of fish in the lake (nearest whole number).

Answer 

Question 6

A survey is planned by asking every 10th person on the school register. Is this likely to give a fair (unbiased) sample?

• A. Yes
• B. No, it is biased

Question 7

In a random sample of 40 students, 17 said they walk to school. There are 480 students in the school. Estimate how many walk to school.

Answer 

Question 8

In a random sample of 50 students, 9 walk or cycle to school. Predict how many of the school's 1200 students walk or cycle to school.

Answer 

Question 9

Scientists tag 47 fish in a lake and release them. Later they catch 80 fish and 8 are tagged. Estimate the number of fish in the lake (nearest whole number).

Answer 

Question 10

A survey is planned by picking names out of a hat containing every student's name. Is this likely to give a fair (unbiased) sample?

• A. Yes
• B. No, it is biased

Question 11

In a random sample of 25 students, 8 said they walk to school. There are 675 students in the school. Estimate how many walk to school.

Answer 

Question 12

In a random sample of 20 students, 3 walk or cycle to school. Predict how many of the school's 540 students walk or cycle to school.

Answer 

Question 13

Scientists tag 45 fish in a lake and release them. Later they catch 80 fish and 8 are tagged. Estimate the number of fish in the lake (nearest whole number).

Answer 

Question 14

A survey is planned by asking people leaving a gym how often they exercise. Is this likely to give a fair (unbiased) sample?

• A. Yes
• B. No, it is biased

Question 15

In a random sample of 40 students, 26 said they walk to school. There are 1160 students in the school. Estimate how many walk to school.

Answer 

Question 16

In a random sample of 20 students, 5 prefer online games to board games. Predict how many of the school's 600 students prefer online games to board games.

Answer