SOLUTION: if Z~ n(0,1) with P(a<Z<1.8)=0.7800, what is the value of a?

Algebra ->  Probability-and-statistics -> SOLUTION: if Z~ n(0,1) with P(a<Z<1.8)=0.7800, what is the value of a?      Log On


   

Question 421488: if Z~ n(0,1) with P(a
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
if Z~ n(0,1) with P(a ----
P(z < 1.8) = 0.9640
-----
0.9640 - 0.7800 = 0.1840
---
Find the z-value with a left tail of 0.1840
invNorm(0.1840) = -0.9000
----
a = -0.9000
====================
Cheers,
Stan H.