Let x, y, z be three observations. The mean of these observations is
\(\dfrac{x \times y \times z}{3}\)
\(\dfrac{x+y+z}{3}\)
\(\dfrac{x-y-z}{3}\)
\(\dfrac{x \times y + z}{3}\)
The mean of observations \(x, y, z\) is given by: \(\dfrac{x+y+z}{3}\).