Answer:
9.43
Explanation:
Numbers: 5
Mean : (70+47+54+46+64)/5 = 56.2
Then, substract the mean from each number and square the result.
(70-56.2 = 13.8), (47-56.2=-9.2),(54-56.2=-2.2), (46-56.2=-10.2), (64-56.2=7.8)
Add the square the differences =
190.44 + 86.64 + 4.84 + 104.04 + 60.84 = 444.8
Variance = 444.8/5 = 88.96
Mean: 56.2
Variance: 88.96
Square root of 88.96 = 9.43