First slide

Introduction to statistics

Question

The following information relates to a sample of size ${Σx}^{2} = 18000, Σx = 960$ . The variance is

Easy

A

6.63
B

16
C

22
D

44

Solution

$\begin{matrix} Variance = \frac{{Σx}_{i}^{2}}{n} - {(\frac{{Σx}_{i}}{n})}^{2} \\ = \frac{18000}{60} - {(\frac{960}{60})}^{2} = 300 - 256 = 44 \end{matrix}$

Get Instant Solutions

When in doubt download our app. Now available Google Play Store- Doubts App

Recieve an sms with download link

Doubts App

OR

SCAN ME

Doubts App

Doubts App