Under what condition is the finite population correction factor used for computing standard deviation of X bar and P bar?

Suppose your school costs for this term were $4900 and financial aid covered 3/4 of that amount. how much did financial aid cover? and how much do you still have to pay?

Anormally distributed data set has a mean of 176.3 and a standard deviation of 4.2. what is the approximate z-score for the data value of 167.9? 2.00 −2.00 8.4 −8.4

[10 points, algebra 2]according to my answer key the restrictions are -1 and 4. but why not positive 1?