Grade 6 Mathematics · Unit 2: Understanding the World Around Us Through StatisticsStandard 6.DS.4

Lesson 2.82.8 Small Group · Group 2

Group 2 · Set BSecond challenge form · new problems, same idea

Mastery check☐ Exceeds☐ Meets target☐ Needs practice
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Learning target I can determine the mean of a data set, use a target mean to find a missing value, and explain the mean as the fair share and the balance point of the data, explain why the method works, and use it on a problem I have not seen before.

Remember2.8 Small Group · Group 2

The mean times the number of values gives the total, so a target mean tells you the total and the missing value. The mean times the number of values gives the total. Use this to find a missing value.

Words: Mean (Media)Average (Promedio)Measure of center (Medida de centro)Balance point (Punto de equilibrio)Data set (Conjunto de datos)

  1. 1Complete each step, then write the final answer.

    The mean of 4 test scores is 80. Three of the scores are 75, 90 and 70. What is the fourth score?

    Show your work
    Final answer:
  2. 2Complete each step, then write the final answer.

    The mean of 5 quiz scores is 7. Four scores are 6, 9, 4 and 8. What is the fifth score?

    Show your work
    Final answer:
  3. 3Complete each step, then write the final answer.

    A runner wants a mean of 3.5 miles a day for 4 days. She ran 3, 4 and 2.5 miles. How far must she run on day 4?

    Show your work
    Final answer:
  4. 4Complete each step, then write the final answer.

    The mean of 6 numbers is 12. One number, 30, is removed. What is the mean of the other 5 numbers?

    Show your work
    Final answer:

Explain your thinkingA value equal to the mean is added to a data set. Does the mean change? Use the balance point to defend your answer.

How did it go? ☐ 4 · I can teach it☐ 3 · I've got it☐ 2 · I need a hint☐ 1 · I need help