Question

What is the middle of 2+2.4+2.8+....+10.4

Answer 1

the numbers are increasing by the factor of 0.4 so the middle number are as follows.

2 + 2.4 + 2.8 + 3.2 + 3.6 + 4 + 4.4 + 4.8 + 5.2 + 5.6 + 6 + 6.4 + 6.8 + 7.2 + 7.6 + 8 + 8.4 + 8.8 + 9.2 + 9.6 + 10 + 10.4