The Solution:
Given:
89, 70, 79, 77, 74, 74, 79, 90, 87.
Required:
To find the mean.
The mean is
[tex]Mean=\frac{sum}{Number}[/tex]So,
[tex]Mean=\frac{89+70+79+77+74+74+79+90+87}{9}[/tex][tex]Mean=\frac{719}{9}=79.8889[/tex]Therefore, the correct answer is 79.8889
