Question 1202552: The department store manager has prepared data on the sales volume of product A for 28 days (sample):
3;1;2;0;2;0;1;3;1;2;5;0;1;2;
0;0;1;1;0;1;2;3;5;2;1;0;3;0.
*Calculate the sample mean and variance.
Found 2 solutions by mananth, math_tutor2020:
Answer by mananth(16946)   (Show Source):
You can put this solution on YOUR website! 0,0,1,1,0,1,2,3,5,2,1,0,3,0,3,1,2,0,2,0,1,3,1,2,5,0,1,2 values (28)
Sum = 42, count =28 mean = 42/28 =1.5
subtract mean from each value above we get
-1.5, -1.5, -0.5, -0.5, -1.5, -0.5, 0.5, 1.5, 3.5, 0.5, -0.5, -1.5, 1.5, -1.5, 1.5, -0.5, 0.5, -1.5, 0.5, -1.5, -0.5, 1.5, -0.5, 0.5, 3.5, -1.5, -0.5, 0.5
Take the square of of each of the above difference
2.25, 2.25, 0.25, 0.25, 2.25, 0.25, 0.25, 2.25, 12.25, 0.25, 0.25, 2.25, 2.25, 2.25, 2.25, 0.25, 0.25, 2.25, 0.25, 2.25, 0.25, 2.25, 0.25, 0.25, 12.25, 2.25, 0.25, 0.25
Total the values =55
55/28 = 1.964285714 = variance
1.401529776 = standard deviation.
Answer by math_tutor2020(3817)  (Show Source):
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