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Activity- statistics problems (view source)
Revision as of 05:23, 14 August 2014
, 05:23, 14 August 2014no edit summary
|10
|10
|08
|08
|}
=INTERPRETATION OF PROBLEM=
=Previous knowledge=
=Solution:=
{|class="wikitable"
|-
|x
|f
|fx
|x²
|fx²
|-
|03
|07
|021
|009
|0063
|-
|08
|10
|080
|064
|0640
|-
|13
|15
|195
|169
|2535
|-
|18
|10
|180
|324
|3240
|-
|23
|08
|184
|529
|4232
|-
|
|n=50
|Σfx=660
|
|Σfx²=10710
|}
Standard deviation σ=<math>\sqrt{\frac {\sum {fx^2}}{n}-({\frac{\sum fx}{n})^2}}</math> <br>
σ=<math>\sqrt{\frac{10700}{50}-({\frac{660}{50})^2}}</math> <br>
σ=<math>\sqrt{214-174.24}</math> <br>
σ=<math>\sqrt{39.96}</math> <br>
σ=6.3
=Problem 3=
Problem No.5 of excercise No.6.3 <br>
Find the varience and Standard deviation for the following data.
{|class="wikitable"
|-
|class intervals
|30-34
|34-38
|38-42
|42-46
|46-50
|50-54
|-
|f
|04
|07
|09
|11
|06
|03
|}
|}