Question

Find the Standard Deviation of . Round you answers to the nearest hundredths.

(4.45, 5.50, 5.50, 6.30, 7.80, 11.00, 12.20, 17.20)

If you help me I’ll send you 3 great songs.

Answer 1

x mean x-mean (x-mean)^2

4.45 8.74 -4.29 18.44

5.50 8.74 -3.24 10.52

5.50 8.74 -3.24 10.52

6.30 8.74 -2.44 5.97

7.80 8.74 -0.94 0.89

11.0 8.74 2.26 5.09

12.2 8.74 3.46 11.95

17.2 8.74 8.46 71.51

mean = average / (n-1) = 69.95 / (8-1) = 8.74

Ok after you do the above table

Add up the last column that will yield: 134.89

Sample variance = 134.99/(n-1) = 134.99/7 = 19.27

Standard deviation is square root of sample variance sqrt(19.27) = 4.39

Explanation: