Question

what is the symbol used to represent standard deviation?
a. $\sigma$
b. $\sigma^2$
c. $\mu$
d. $\pi$

Explanation:

To determine the symbol for standard deviation, we analyze each option:

• Option a: $\sigma$ is the symbol for population standard deviation.
• Option b: $\sigma^2$ represents population variance (the square of standard deviation).
• Option c: $\mu$ is the symbol for the population mean.
• Option d: $\pi$ is a mathematical constant (approximately 3.14159) and not related to standard deviation.

So, the correct symbol for standard deviation is $\sigma$.

Answer:

a. $\sigma$