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If the average (arithmetic mean) of 5 numbers j, j + 5, 2j - 1, 4j -2, and 5j- 1 is 8, what is the value of j?
  • a)
    1/3
  • b)
    7/13
  • c)
    1
  • d)
    3
  • e)
    8
Correct answer is option 'D'. Can you explain this answer?

Answers

Arthmetic means = sum of total numbers /numbers
(j + j + 5 + 2j-1 + 4j - 2 + 5j - 1)/5 = 8
(13j + 5 - 4)/5 = 8
(13j + 1) = 40
13j = 40 – 1 = 39
j = 39/13 = 3 ans.

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Arthmetic means = sum of total numbers /numbers(j + j + 5 + 2j-1 + 4j - 2 + 5j - 1)/5 = 8(13j + 5 - 4)/5 = 8(13j + 1) = 4013j = 40 – 1 = 39j = 39/13 = 3 ans.