Question 1155247
start with z for 0.995=2.576
z*sigma/sqrt(n)=0.8
2.576*10.97/sqrt(n)=0.8
28.26=0.8* sqrt(n)
square both sides and divide by 0.64, which is 0.8^2.,
n=1247.875 or 1248, rounding upward