Unit 8, Lesson 12
Larger Populations
Grade 7
Practice
Problem 1
Suppose you are interested in learning about how much time seventh-grade students at your school spend outdoors on a typical school day.
Select all the samples that are a part of the population you are interested in.
The 20 students in a seventh-grade math class.
The first 20 students to arrive at school on a particular day.
The seventh-grade students that participate in a science fair put on by the four middle schools in a school district.
The 10 seventh graders on the school soccer team.
The students on the school debate team.
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Problem 2
For each sample given, list two possible populations they could belong to.
- Sample: The prices for apples at two stores near your house.
- Sample: The days of the week the students in your math class ordered food during the past week.
- Sample: The daily high temperatures for the capital cities of all 50 U.S. states over the past year.
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Problem 3
If 6 coins are flipped, find the probability that there is at least 1 flip that lands on heads.
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Problem 4
A school's art club holds an art sale on Fridays to raise money for art supplies. Here is the amount of money in dollars they made each week in the fall and in the spring:
- fall
- 20
- 26
- 25
- 24
- 29
- 20
- 19
- 19
- 24
- 24
- spring
- 19
- 27
- 29
- 21
- 25
- 22
- 26
- 21
- 25
- 25
-
Find the mean amount of money made in the fall and in the spring.
-
The MAD for the fall data is 2.8 dollars. The MAD for the spring data is 2.6 dollars. Express the difference in means as a multiple of the larger MAD.
-
Based on this data, do you think that sales are generally higher in the spring than in the fall?
Problem 5
A school is selling candles for a fundraiser. They keep 40% of the total sales as their commission, and they pay the rest to the candle company.
| price of candle | number of candles sold |
|---|---|
| small candle: \$11 | 68 |
| medium candle: \$18 | 45 |
| large candle: \$25 | 21 |
How much money must the school pay to the candle company?
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