f1x12 + f2x22 + -----+ fxx42=___________?
Correct answer: A. Σu1=1 ƒ ixi2
- A. Σu1=1 ƒ ixi2
- B. Σni-1 ƒ ixi2
- C. Σpi=1 ƒ ixi2
- D. Σmi=1 ƒ ixi2
Explanation
The repeated terms follow the summation pattern [1m[0mΣfᵢxᵢ², with each frequency multiplied by the square of its corresponding value. Option a is the intended notation, although the displayed subscripts are poorly formatted.
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