Question 1044665
90% confidence has a z=1.645
the standard error is sigma/sqrt(n). Their product is the interval.
z*sigma/sqrt(n)=SE=1.645*14.2/sqrt (n)=23.359/sqrt(n)=1
Therefore, multiplying both sides by sqrt(n), 23.359=sqrt(n)
square both sides and n=545.64 or 546