Find the area under the normal distribution curve between z = 1.80 and z = 2.20.
A. 0.950

B. 0.464

C. 0.022

D. 0.486

Question

Find the area under the normal distribution curve between z = 1.80 and z = 2.20. 
 A. 0.950  
 
 B. 0.464  
 
 C. 0.022  
 
 D. 0.486

mathmate · Answer

From a normal distribution table (pdf) of probabilities:
1.8 | 0.9641
2.2 | 0.9861
What is the difference

anonymous · Answer

thanks mathmate
do you think you can help me out with some more question or send me that table

mathmate · Answer

Sure! http://www.math.unb.ca/~knight/utility/NormTble.htm

anonymous · Answer

can the same chart be used for negative numbers
?

mathmate · Answer

|dw:1357650629831:dw|
Yes, but the chart starts from zero.
To use negative values, you would make use of symmetry (about Z=0), and the fact that the graph area from -inf to +inf is 1.0.
So for -0.5, you would look-up Z=0.5 to get 0.6915 and subtract from 1 to get 0.3085.