Question

Calculate the sd of the following data 3, 4, 9, 11, 13, 6, 8, 10.

• A. 3.24
• B. 2.89
• C. 4.15
• D. 3.85

Answer 1

Answer:

A. 3.24

SD = √{x²/n - x̄²}

x̄ = {3, 4, 9, 11, 13, 6, 8, 10}/8

= 8

x	x²
3	9
4	16
9	81
11	121
13	169
6	36
8	64
10	100
64	596

SD = √{596/8 - 8² }

= √{74.5 - 64}

= √10.5

= 3.24