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26 August, 23:16

4. The mean of 12 numbers is 5.5. Eleven

of the numbers are 5, 6,5,3,4,5,7,6,9,

7 and 5. Find

a) the twelfth number.

b) the mode of the twelve numbers.

c) the sum of the mode and the mean.

+4
Answers (2)
  1. 26 August, 23:26
    0
    a) 4

    b) 5

    c) 9

    Step-by-step explanation:

    a) let the 12th number b x

    Mean = sum/n

    5.5 = (5+6+5+3+4+5+7+6+9+7+5+x) / 12

    5.5*12 = 62+x

    66 = 62+x

    x = 4

    b) set is: 3,4,4,5,5,5,5,6,6,7,7,9

    Mode is 5 (most frequent)

    c) mode+mean = 5+4 = 9
  2. 26 August, 23:36
    0
    A) 4

    B) Mode is 5

    C) 10.5

    Step-by-step explanation:

    A) 62+x/12

    (62 + x) : 12 = 5.5 * 12

    62 + x = 66

    * = 66-62

    *=4

    B) mode is the highest occuring no which is 5

    C) mean has been given as 5.5; mean plus mode = 10.5
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