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