Array formula are confirmed by pressing CTRL+SHIFT+ENTER to activate the array, not just ENTER. You will know the array is active when you see curly braces { } appear around your formula. If you do not CTRL+SHIFT+ENTER you will get an error or a clearly incorrect answer.
@ John with due respect, I think totals are missing
@PJH try below in C5 and then drag down and across, array entered
Red part is rows from 5 to 10 and 2 represent column B so it becomes B5,B6,B7,B8,B9 and so on
Second red part Column(C1) represents 3 then in next cell it become Column(D1) means 4 and so on
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