Question

(50 points) (with explanation)
find the mean of following data. 80,85,100,60,71,90

Answer 1

Mean formula : $\frac{∑fi}{xi}$ 
                                        or  
                         Sum of observations ÷ number of observation 

Observations are : 80,85,100,60,71,90
Sum of the observations = 486 
number of observations = 6 

by substituting the above values in the formula 
⇒ 486 ÷ 6
⇒ 81 
∴ mean of the data i.e. 80,85,100,60,71,90 is "81"

Answer 2

Hello mate here is your answer.

Please reffer to the attachment :)

Hope it helps you.