Can I get help with this question A group of students test s

A group of students test scores at Greendale Community College were recorded to determine academic performance differences between majors . That data is prescribed below: Using the data above find the total sum of squares.

Solution

Grand Mean = [ 80 + 72 + 67 + 70 + 75 + 92 + 80 + 92 + 75 + 84 + 83 + 80 ] / 12
   = 79.1666667
Total sum of squares = [ ( 80 - 79.1666667 ) ^2 ] + [ ( 72 - 79.1666667 ) ^2 ] + [ ( 67 - 79.1666667 ) ^2 ] + [ ( 70 - 79.1666667 ) ^2 ] + [ ( 75 - 79.1666667 ) ^2 ] + [ ( 92 - 79.1666667 ) ^2 ] + [ ( 80 - 79.1666667 ) ^2 ] + [ ( 92 - 79.1666667 ) ^2 ] + [ ( 75 - 79.1666667 ) ^2 ] + [ ( 84 - 79.1666667 ) ^2 ] + [ ( 83 - 79.1666667 ) ^2 ] + [ ( 80 - 79.1666667 ) ^2 ]
= 687.6666667
~ 688