For some data with respective frequencies , the value of is equal to

Question

For some data $x_{1}, x_{2}, \dots, x_{n}$ with respective frequencies $f_{1}, f_{2}, \dots, f_{n}$ , the value of $\sum_{1}^{n} f_{i} (x_{i} - \bar{x})$ is equal to:

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(4) 0

Solution

Q.
For some data $x_{1}, x_{2}, \dots, x_{n}$ with respective frequencies $f_{1}, f_{2}, \dots, f_{n}$ , the value of $\sum_{1}^{n} f_{i} (x_{i} - \bar{x})$ is equal to:

1 $n \bar{x}$

2 $1$

3 $\sum f_{i}$

4 $0$

Ans.
(4) 0

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Solution

Q. For some data x1,x2,…,xn with respective frequencies f1,f2,…,fn, the value of ∑1nfi(xi-x¯) is equal to:

1 nx¯

2 1

3 ∑fi

4 0

Ans. (4) 0

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Q.
For some data $x_{1}, x_{2}, \dots, x_{n}$ with respective frequencies $f_{1}, f_{2}, \dots, f_{n}$ , the value of $\sum_{1}^{n} f_{i} (x_{i} - \bar{x})$ is equal to:

1 $n \bar{x}$

2 $1$

3 $\sum f_{i}$

4 $0$

Ans.
(4) 0