Question

If sigma(x-9)=0 for data having 5 observations, then what is the value of mean?
(a)Mean=0
(b)Mean=5
(c)Mean=9
(d)Mean=45

Post the method for getting the answer. ​

Answer 1

Answer:

(c)Mean=9

Step-by-step explanation:

sigma(x-9)=0

Number of observations=5

sigma(x)-sigma(9)=0

Here we se sigma means addition of five observations,as same way 9 should be added five times.

sigma(x)-9(5)=0

sigma(x)=45

We know mean=Sum of observations/Number of observations

sigma(x)/5=45/5

Mean=9