Answer:
mean 20
standard deviation 8.732
Step-by-step explanation:
25+ 16 +28+6+30+7+26+20 +22 = 180
180/9 = 20
mean 20
median 22
sample standard deviation 8.732
standard deviation shows the average distance from the mean value of all values in a set of data
standard deviation subtracts each data from the average or mean
standard deviation formula:
square root of [(data1 minus mean)^2 + (data1 minus mean)^2..etc divided by the (number of numbers in the data set)]
√((25-20)^2 + (16-20)^2 + (28-20)^2 + (6-20)^2 + (30-20)^2 + (7-20)^2 + (26-20)^2 + (20-20)^2 + (22-20)^2) divided by 9) =
√(5)^2 + (-4)^2 + (8)^2 + (-14)^2 + (10)^2 + (-13)^2 + (6)^2 + (0)^2 + (2)^2) ÷ (9) =
√(25 + 16 + 64 + 196 + 100 + 169 + 36 + 0 + 4) ÷ (9) =
√(25 + 16 + 64 + 196 + 100 + 169 + 36 + 0 + 4) ÷ (9) =
√610÷ 9 =
√67.7777777778
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