MathematicsKhilona earned scores of 97, 73 and 88 respectively in her first three examinations. If she scored 80 in the fourth examination, then her average score will be

Khilona earned scores of 97, 73 and 88 respectively in her first three examinations. If she scored 80 in the fourth examination, then her average score will be


  1. A
    Increased by1
  2. B
    Increased by1.5
  3. C
    Decreased by1
  4. D
    Decreased by1.5  

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    Solution:

    Given, scores of Khilona as 97, 73 and 88 .
    To find, the average score.
    Average  =sum of all numbersNumber of observations
    Then, the average will be,
    Average =97+73+883
    2583
    86
    It is given that she scored 80 in the fourth examination.
    When 80 is added to the score list then,
    Average =97+73+88+804
    3384
    84.5 86-84.5 = 1.5, which means the average was greater in the first three examinations and now the score has reduced to 84.5.
    Hence, the average is decreased by 1.5. Hence, option 4 is correct.
     
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