Question

Look at pic for Q. Thanks!

Answer 1

AWww...statistics/data management?

Answer 2

oh. this was a looooonnnnggg time ago for me....

Answer 3

It would be good if you could do this by hand
The notation is just short-hand. The sum form k= 1 to 5 of (2k+3)
means replace k with 1 and do the arithmetic: 2*1+3 = 2+3=5
that is the first number in the series.
now set k=2 and redo the arithmetic: (2*2+3)= 7
that is the second number in the series
Do that for each k, up to k=5, where you should get 13
so the sigma is short for
5+7+9+11+13
= 45