The mean of the numbers 13, 16, x, 18, 21, 2x, 35, is 22. Find the value of x
A
16
B
17
C
23
D
25
Verified Correct Answer: B.
Step-by-Step Mathematical Solution
Mean = \(\frac{ 13 + 16 + x + 18 + 21 + 2x + 35}{7}\) = 22
103 + 3x = 154
3x = 154 - 103 = 51
x = \(\frac{51}{3}\) = 17
Source: WAEC / JAMB / NECO Classroom Archive (Record #70281)