Difference between revisions of "Activity- statistics problems"
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|Σfx²=10710 | |Σfx²=10710 | ||
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+ | 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{1530}{10}-{144}}</math> <br> | ||
+ | σ=<math>\sqrt{153-144}</math> <br> | ||
+ | σ=<math>\sqrt{9}</math> <br> | ||
+ | σ=3 |
Revision as of 06:48, 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 | 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 |
σ=
σ=
σ=
σ=
σ=
σ=3