Math Practice 101
Homework Explained - Math Practice 101

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Grade 7 HMH Go Math - Answer Keys


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10.1 Populations and Samples

  • Question 1 (request help)

    A company uses a computer to identify their 600 most loyal customers from its database and then surveys those customers to find out how they like their service. Identify the population and determine whether the sample is random or biased.
  • The sample is    

10.2 Making Inferences from a Random Sample

  • Question 2 (request help)

    A university has 30,330 students. In a random sample of 270 students, 18 speak three or more languages. Predict the number of students at the university who speak three or more languages.
  •     students

10.3 Generating Random Samples

A store receives a shipment of 5,000 MP3 players. In a previous shipment of 5,000 MP3 players, 300 were defective. A store clerk generates random numbers to simulate a random sample of this shipment. The clerk lets the numbers 1 through 300 represent defective MP3 players, and the numbers 301 through 5,000 represent working MP3 players. The results are given.

13   2,195   3,873   525   900   167   1,094   1,472   709   5,000

  • Question 3 (request help)

    Based on the sample, how many of the MP3 players might the clerk predict would be defective?
  •     MP3's
  • Question 4 (request help)

    Can the manufacturer assume the prediction is valid? Explain.
  •    

  Essential Question  

  • Question 5 (request help)

    How can you use random samples to solve real-world problems?
  • Type below:

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