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Mean

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Intros
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Lessons
  1. What is mean absolute deviation (MAD)?
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Examples
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Lessons
  1. Calculate the mean of each set of data. Round your answer to the nearest tenth.
    1. 4, 8, 9, 7, 7
    2. 4.5, 5, 5.1, 10, 13.4, 2, 1
    3. 81, 50, 82, 99, 213, 75
  2. A survey collected information about the total amount of time teens spent on computers each week. Only data from four cities is listed below.

    Cities

    Computer time (hours per week)

    A

    15.3

    B

    17.5

    C

    12.4

    D

    13.9

    1. What is the mean for the four cities listed? Round your answer to the nearest tenth.
    2. If the mean for all cities in the country was 16.2 hours, would you predict the mean of the cities not listed to be more or less than 16.2 hours?
  3. Harry was given the following marks on his English essays:
    69%, 71%, 85%, 80%, 93%, 99%
    1. Calculate his mean mark? Round your answer to the nearest whole percent.
    2. What mark would he need to receive on the next essay to increase his mean by 2 percent for the seven essays?
    3. Harry's friend, Thomas, received the following marks on his English essays:
      96%, 74%, 75%, 66%, 96%, 90%
      What is Thomas's mean mark? Round your answer to the nearest whole percent.
    4. Who has a smaller mean absolute deviation? Harry or Thomas? What does this tell you?