Difference between revisions of "Activity- statistics problems"

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Line 96: Line 96:
 
σ=<math>\sqrt{\frac {\sum {fx^2}}{n}-({\frac{\sum fx}{n})^2}}</math> <br>
 
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{\frac{10700}{50}-({\frac{660}{50})^2}}</math> <br>
σ=<math>\sqrt{\frac{1530}{10}-{144}}</math> <br>
+
σ=<math>\sqrt{214-174.24}</math> <br>
σ=<math>\sqrt{153-144}</math> <br>
+
σ=<math>\sqrt{39.96}</math> <br>
σ=<math>\sqrt{9}</math> <br>
+
σ=6.3
σ=3
 

Revision as of 06:53, 13 August 2014

Problem 1

If n =10, = 12 and

INTERPRETATION OF PROBLEM

Previous knowledge

Solution:





σ=
σ=
σ=
σ=
σ=
σ=3

Problem 2

Find the Standard deviation for the following data.

x 03 08 13 18 23
f 07 10 15 10 08

INTERPRETATION OF PROBLEM

Previous knowledge

Solution:

x f fx 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


σ=
σ=
σ=
σ=
σ=6.3