Question 1086435
Top 15% are above z=+1.037
bottom 10% are below z=-1.645
sd is 15%, so anything more than .246 or .25  below 76 is fail, so less than 51% fails.  
sd is 15% so anything more than 15.56 or .16 above 76 is pass, so 92% passes
z=(x-mean)/sd
z.10=-1.645=(x-76)/15
z.85=+1.037=(x-76)/15, solve for x