Grade 7 · Math

7th grade Predict about a whole group from a sample worksheet

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Predict about a whole group from a sample

Grade 7 Math Worksheet

NameDate

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

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?
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Each dot is one student.
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?
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?
Tala asked a random sample of 8 of the 120 students about pages read in an hour. Nobody read the index twice. About how many pages in all would the 120 students have?
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?
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?
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?
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?
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?
Ren took six random samples of 10 students from 360 students. The kickstand kept quiet. How far apart are the highest and the lowest sample mean?

7th grade Predict about a whole group from a sample worksheet – printable — Print: 1 2 3 4 5 6

About this worksheet

Predict about a whole group from a sample. Every version has 10 questions, and the answer key prints on the second page.

What your child will learn

I can say how many students each dot of a sample stands for, and scale a yes count up to the whole group.
I can use a sample mean to predict a total for the whole group.
I can say why one prediction is not enough: different random samples give different numbers, so I give a range or say "about".

Standard: 7.SP.A.2

Words to know

random sample: Some members picked by chance, so they stand for the whole group.

prediction: A fair guess about the whole group, made from a sample.

yes stack: The dots in a sample that answered yes, piled in one column.

mean: The balance point: the total of the dots ÷ the number of dots.

each dot stands for: How many members of the whole group one sampled dot speaks for.

estimate: A number found from a sample that is close to, but not exactly, the real one.

vary: Change from one random sample to the next.

Common mistakes

Your child subtracted the group size and the sample size.

Your child multiplied the group size and the sample size.

Your child shared the group among the yes dots only.

What to say

Ask: if the sample is a small copy of the group, how many students does each sampled student stand for?

Ask: if every dot stands for the same number of students, do the dots times that number add up to the whole group?

Ask: does the no stack stand for students too?

Questions parents ask

What is the most common mistake with predict about a whole group from a sample?

Your child subtracted the group size and the sample size.

How can I help my child with predict about a whole group from a sample?

Ask: if the sample is a small copy of the group, how many students does each sampled student stand for?

Are these 7th grade math worksheets free to print?

Yes. All 6 printable versions at each level are free to print, with the answer key, and no account is needed.

More grade 7 math

See all grade 7 math

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