Under the normal curve the area between z1 and z 2 includes

Under the normal curve, the area between z=1 and z =-2 includes __________ of the values.

Solution

z1 = lower z score =    -2      
z2 = upper z score =     1      
          
Using table/technology, the left tailed areas between these z scores is          
          
P(z < z1) =    0.022750132      
P(z < z2) =    0.841344746      
          
Thus, the area between them, by subtracting these areas, is          
          
P(z1 < z < z2) =    0.818594614 or 81.8594614% of values [ANSWER]