document.write( "Question 314031: I am working my statistics class, and am having issues finding the correct formula for finding the value x such that P(X > x) is equal to a number, given that, X is a normal random variable with the mean equaling to a number and standard deviation equaling to a number.\r
\n" ); document.write( "\n" ); document.write( "I have been using the following formula, but it is not working right:\r
\n" ); document.write( "\n" ); document.write( "z = X - mean / standard deviation\r
\n" ); document.write( "\n" ); document.write( "I did not want you to work the problem for me, I just need assistance without getting the answer.\r
\n" ); document.write( "\n" ); document.write( "Thank You in advance...Rosanna \n" ); document.write( "

Algebra.Com's Answer #224505 by stanbon(75887) $\"\"$ $\"About$

You can put this solution on YOUR website!
I am working my statistics class, and am having issues finding the correct formula for finding the value x such that P(X > x) is equal to a number
\n" ); document.write( "----
\n" ); document.write( "Let's say P(X>x) = k
\n" ); document.write( "That means you have a right tail of \"k\" on the z-distribution curve.
\n" ); document.write( "---
\n" ); document.write( "Use invNorm(1-k) to find the z-value that has that right tail.
\n" ); document.write( "---
\n" ); document.write( "Then use x = zs+u to find the value of x you are asked to find.\r
\n" ); document.write( "\n" ); document.write( "Cheers,
\n" ); document.write( "Stan H.
\n" ); document.write( " \n" ); document.write( "

\n" );