Age of 4 members in a family are: 2 years, 6 years, 8 years and 16 years. Fine standard deviation of their ages?

Question

Raghav scored below runs in his last 7 innings
13, 38, 3, 29, 14, 68, 17.

Find population standard deviation for his score in last 7 innings?

Answer 1

Average = (2+6+8+16)/4 = 32/4 = 8.
Variance = ((8-2)^2 + (8-6)^2 + (8-8)^2 + (8-16)^2)/4 = (36+4+0+64)/4 = 26.
Standard Deviation = 26^0.5 = 5.099
Sample Standard Deviation = 5.8878