If Z represents the standard normal distribution find the po

If Z represents the standard normal distribution, find the point c such that P(-c < Z < c) = 0.8

Solution

Getting the outward areas of the two extreme tails,          
          
alpha/2 = (1-middle area)/2 =    0.1      
          
Thus, the z values bounding these tails, using table/technology,          
          
-c = lower z value =    -1.281551566      

Thus,

c = upper z value =    1.281551566   [ANSWER]