I disagree with all the options. The correct answer is 164.71
The formula is SquareRoot of x minus x-bar squared over n minus 1
n = 5, so n - 1 = 4
X-bar = 394 (300 + 430 + 170 + 470 + 600) / 5 = 394
x - x-bar squared is therefore (300-394)^2 = 8836, (430-394)^2 = 1296, (170-394)^2=50176, (470-394)^2= 5576, (600-394)^2=42436
So, x - x-bar squared for each dog is 8836, 1296, 50175, 5776, 42436
Now sum those numbers (Sigma): 8836 + 1296 + 50176 + 5776 + 42436 = 108520
Divide result by the sample count minus 1 (n-1 = 4)
108520 / 4 = 27130
Square root of 27130 = 164.71
A. 147.
(300 + 430 + 170 + 470 + 600) / 5 = 394. Mean is 394.
sqrt(((300 - 394)^2 + (430 - 394)^2 + (170 - 394)^2 + (470 - 394)^2 + (600 - 394)^2) / 5)) = 147. Standard deviation is 147.
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LtCmrData
1 month, 3 weeks agoSwift_and_Quick
8 months, 1 week ago