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25 September, 01:09

Using measures of central tendency:

5. Write and solve an equation to find the value of "x". 3.8, 4.2, 5.3, x; mean 112

7. Write and solve an equation to find the value of "x". 100, 121, 105, 113, 108, x; mean 112

9. Find the range. 12, 15, 17, 28, 30

11. Find the range. - 12, - 15, 5, 3, - 2, 0, - 7

13. For each list of data, find the range and the mean. Use the range to compare the spread of the data.

List 1: 64, 43, 55, 28, 71. List 2: 48, 53, 61, 47, 51

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Answers (1)
  1. 25 September, 01:33
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    Step-by-step explanation:

    5)

    Mean, 112 = (3.8+4.2.5.3+x) / 4

    448 = 13.3 + x

    x = 448-13.3=434.7

    7)

    Mean, 112 = (100 + 121 + 105 + 113+108 + x) / 5

    560 = 547 + x

    x = 560-547=13

    9) 12, 15, 17, 28, 30

    Range = highest - lowest = 30-12

    =18

    11) - 12, - 15, 5, 3, - 2, 0, - 7

    Range = highest - lowest = 5--15

    =20

    64, 43, 55, 28, 71

    Mean = (64+43+55 + 28 + 71) / 5

    =52.2

    Range = 71-28=43

    8, 53, 61, 47, 51

    Mean = (8+53+61 + 47 + 51) / 5

    =220/5 = 44

    Range = 61-8=53

    Spread = 53-43=10
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