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Find x if the mean of 2x, 4x, 2x - 13 and 6x is 4.

Mathematics
JAMB 2022

Find x if the mean of 2x, 4x, 2x - 13 and 6x is 4.

  • A. 1.5
  • B. 2.0
  • C. 1.0
  • D. 0.5
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Correct Answer: Option B
Explanation

mean (4) =  \(\frac{2x + 4x + 2x - 13 + 6x}{4}\)

16 = 14x - 13

16 + 13 = 14x

x = 29/14 or 2.07

There is an explanation video available below.

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