X~N(8,25)
P( )=0.4
We need to find a.
I decided to use GC and standardize it to find a.
P( )=0.4
Since it is now standardized,
P( )
=1-2P( =0.4
P( =0.3
P( =0.7
So I used Ti84 InvNorm Function to get =0.5244
Which means is 10.622. However, the ans is 6.75.
Anyone can point out my mistake?
Thanks.