Calculate for z- scores 73, 14, 21, 45, 18, 74, 32, 37

You can surely do this!  First, find the mean of the 8 given scores.  Add up these scores and then divide the result (sum) by 8 to obtain the mean.
                                                     
                                                       raw score - mean
The formula for "z-score" is    z =
                                                       std. deviation

You'll need to calculate the standard deviation of these 8 scores.
                                                                                                      73 - mean
Then, as an example:  raw score 73 translates into z-score  z =
                                                                                                       std. dev.

A) for the n row: 22+(n-1)×6therefore,b) 100-22=78that means (n-1)×6=7878÷6=1313+1=1414th row has 100 seats