If x,s are the mid points of the class intervals of grouped data, fi are the corresponding frequencies and x is the mean, then Σ(fixi – x̄) is equal : (1)
A. 0
B. -1
C. 1
D. 2
Answer:A
If x,s are the mid points of the class intervals of grouped data, fi are the corresponding frequencies and x is the mean, then Σ(fixi – x̄) is equal : (1)
A. 0 B. -1 C. 1 D. 2