z = 77
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(z=-3) and (z=7)
6z-4z-z = 6-7-4 z = -5
If 3z/2 = 9 then the value of z is 6
If Z = 3, then (9 + 7Z) = [ 9 + 7(3) ] = 9 + 21 = 30
The formula for Z obtained is zobt equals the average of the sample (Xbar)minus the average of the population (u), divided b the standard deviation of the sample (s), divided be the square root of N. Example: Zobt= X-u ,divided by s ,divided by ,square root of N