The mean of 1, 3, 5, 7 and x is 4. Find the value of x

  • A 2
  • B 4
  • C 6
  • D 8
waec 2018mathematics

The correct answer is B. 4

Mean = \(\frac{\sum x}{n}\)

4 = \(\frac{1 + 3 + 5 + 7 + x}{5}\)

4 x 5 = 16 + x

20 - 16 = x

4 = x

x = 4

Previous question Next question