a) Suppese the standard deviation of eamings in Educational Servioes for the whole of the oty was $13.400 and we want the standard deviation of average eamings in our survoy to be $1000. What sample size do wo need to take? b) Suppose we used a sample of sice 350 for our estintete of average eaninge in Financial Services and the standurd devirition of eamings in our survey was. 518700. What is the standard erfor of the average earnings in Financial Sorvices? a) The sample size nooded in (Round up to the noirest whale number)