Question

If di = xi-A
sum of fi= 25, A = 25 and x= 25, then fidi=
A) 0
B) 25
C) 14​

Answer 1

Answer:

0 is correct answer

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Answer 2

Answer: Zero is the required answer.

Explanation:

Given $d_{i} =x_{i} -A$ , $A=25$ and $x=25$.

Now, ∑$f_{i} =25.$

Now to calculate $f_{i} d_{i}= f_{i}[x_{i} -A]= f_{i}x_{i} -f_{i}A$.

⇒$f_{i}x_{i} -f_{i}A = 25*25-25*25=625-625=0.$