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STATISTICS DOUBT!!! PLZ REPLY ASAP!!!

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I Jimmy I:
Hello everyone!
Im having an AS reset this year and frankly forgot some basics.....

My doubt is Question 5(ii) of Oct/Nov 2006

Given,
Mean(meou)=?
Variance=root(21)

This is how I tried solving it,
1.P(X>10)=0.7389
2.1-phi( (10-meou) / root21)=0.7389
3.-phi(10-meou/root21)=0.7389-1
4.phi(10-meou/root21)=0.2611

After step4 I get confused on how to find z of 0.2611, whether to do phy-1(0.2611) and make it -ve or what!
Someone plz solve this and then ill ask my doubt more clearly

I Jimmy I:
My doubt was if given to find the phy-1 of any probability below 0.5 then I should do 1-(x) and add a -ve sign infront of that value or not...?

Arthur Bon Zavi:

--- Quote from: I Jimmy I on May 23, 2011, 07:26:29 pm ---My doubt was if given to find the phy-1 of any probability below 0.5 then I should do 1-(x) and add a -ve sign infront of that value or not...?

--- End quote ---

Correct.

Arthur Bon Zavi:

--- Quote from: I Jimmy I on May 23, 2011, 07:26:29 pm ---My doubt was if given to find the phy-1 of any probability below 0.5 then I should do 1-(x) and add a -ve sign infront of that value or not...?

--- End quote ---

Yes add a negative value whenever you do this. This was the only doubt ? So the same you apply to the question in the paper you have posted.

I Jimmy I:
Ye that was my only doubt :D

Other working is easy :D Just wanted to understand the concept! Anyways tyvm for confirming :D

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