Question

calculate each value requested for the following set of scores. scores: 1, 2, 0, 2 (a) $sigma x$ (b) $sigma x^{2}$ (c) $(sigma x)^{2}$

Explanation:

Step1: Calculate $\sum X$

Sum up the scores. $1 + 2+0 + 2=5$

Step2: Calculate $\sum X^{2}$

Square each score and sum them. $1^{2}+2^{2}+0^{2}+2^{2}=1 + 4+0 + 4 = 9$

Step3: Calculate $(\sum X)^{2}$

First find $\sum X$ (which is 5 from Step 1), then square it. $5^{2}=25$

Answer:

(a) 5
(b) 9
(c) 25