Question

The ages of ELEVEN(11) students on Environmental Awareness Camp are:

12 9 11 7 10 10 9 9 8 9 11
Find the mean and standard deviation
A. Mean = 9.545; Standard deviation = 1.440
B. Mean = 9.545; Standard deviation = 2.073
C. Mean = 10.5; Standard deviation = 1.440
D. Mean = 10.5; Standard deviation = 2.073

Answer 1

Gonna be smart. This took me a long time.

Step-by-step explanation:

Result Standard Deviation, σ: 1.3726971700492

Count, N: 11

Sum, Σx: 105

Mean, μ: 9.5454545454545

Variance, σ2: 1.8842975206612

Steps

σ2 = Σ(xi - μ)2

N= (12 - 9.5454545454545)2 + ... + (11 - 9.5454545454545)2

11

=

20.727272727273

11

= 1.8842975206612

σ = √1.8842975206612

= 1.3726971700492

In simple words. A.