If the arithmetic mean of the numbers 3, 4, 8, 5, x, 3 is 4, find the value of x.
If the arithmetic mean of the numbers 3, 4, 8, 5, x, 3 is 4, find the value of x.
Since the mean of 6 numbers is 4, their total sum must be 6 x 4 = 24. The sum of the known numbers is 3+4+8+5+3 = 23. So x = 24 - 23 = 1.
Re-check your working by substituting the answer back into the original question.