The arithmetic mean of the observations 79, 92, 39, 57, 91, 28, 74, 90 and 44 is:

Correct option is C

Given:

Observations = 79, 92, 39, 57, 91, 28, 74, 90, 44;

Number of observations n = 9.

Formula Used:
Arithmetic Mean $$=\dfrac{\text{Sum of observations}}{n}$$​​

Solution:
Sum =$$79+92+39+57+91+28+74+90+44=594$$​​
Mean $$=\dfrac{594}{9}=66$$​​