Question 1128019
z=(x-mean)/sd
z>(60-55.5)/11.2=4.5/11.2=0.40
probability z>0.40 is 0.3446

z(0.15)=-1.036
x-mean=-1.036*11.2=-11.60
x=55.5-11.60=43.4

for 20 forms, the std error is std dev/sqrt(20)
z>(60-55.5)/11.2/sqrt(20)
z>(4.5)*sqrt*(20)/11.2, or 1.8 
That probability is 0.0359