Qualification > Math

statistics n09

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khi2ruh:
neways n09 q1 part 2
variant 2 please

Freaked12:

--- Quote from: khi2ruh on May 26, 2010, 02:50:59 am ---neways n09 q1 part 2
variant 2 please

--- End quote ---
Sorry man i went to sleep

3 hours to go for CIE exam.

I dont have the question paper for this but i think this is the one where you have to find standard deviation sa7?

x<39=0.25 (as this is the lower quartile)
and then
(39-51)sigma=0.25

1-0.25=0.75
which if you look at the table at the bottom on the normal distribution graph states the corresponding value to be 0.674
which will be -0.674 because its on the negative side

-12/sigma=-0.674
sigma=
-12/-0.674=sigma
sigma=17.8

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