First slide

Introduction to statistics

Question

What is the standard deviation of the following data?

Moderate

A

81
B

76
C

9
D

2.26

Solution

$\begin{matrix} σ^{2} = c^{2} [\frac{\sum f_{i} u_{i}^{2}}{\sum f_{i}} - {(\frac{\sum f_{i} u_{i}}{Σ f_{i}})}^{2}] \\ = 10^{2} [\frac{9}{10} - {(\frac{- 3}{10})}^{2}] = 90 - 9 = 81 \\ \Rightarrow σ = 9 \end{matrix}$

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