can someone give me the standard deviation for the following set of numbers?: 2 5 8?

Question

thanks!

Answer 1

Variance = (∑x²)/n - (∑x/n)²
= (4 + 25 + 64)/3 - [(2 + 5 + 8)/3]²
= 31 - 25
= 6
Thus standard deviation = √(variance)
= √6

Answer 2

(2 + 5 + 8)/3 = 15/3 = 5

Variance = ((2 - 5)^2 + (5 - 5)^2 + (8 - 5)^2)/3
V = ((-3)^2 + 0^2 + 3^2)/3
V = (9 + 9)/3
V = 18/3
V = 6

SD = sqrt(6)

SD = about 2.4495