Question

Find the arithmetic mean of the first 3 positive integers and first 3 negative integers ( do not include 0 )

• A. 5
• B. -1
• C. 0
• D. -4

Answer 1

The correct option is C

0

The first 3 positive integers = 1 , 2 and 3

The first 3 negative integers = -1, -2 and -3

Hence sum of observation = 1 + 2 + 3 + (-1) + (-2) + (-3)

= 0

Mean = $\frac{sumofobservation}{6}$

= $\frac{0}{6}$

= 0