Question

Assume that n distinct values x1,x2,...,xn occur with frequencies $f_1,f_2....,f_n$. respectively, If $\bar{x}=7$ and $\displaystyle\sum^{8}_{i=1}f_ix_i=315$, then $\displaystyle\sum^{8}_{i=1}f_i=$

• A. 35
• B. 45
• C. 48
• D. 42
• E. 40

Answer 1

Answer: (B)

45

Answer 2

The correct option is (B): 45