It's 1/7 of (the sum of all 7 numbers), also often called their "average".
LCM(40, 45, 50, 55) = 19800
5.
40, 42, 44, 45, 46, 48, 49, 50, 51, 52, 54, 55
45, 50, 55
46.5
LCM(40, 45, 50, 55) = 19800
5.
5.
72
40, 42, 44, 45, 46, 48, 49, 50, 51, 52, 54, 55
45, 50, 55
A little over 50".
46.5
45, 50, 55, 60, 65, 70, 75
20, 25, 30, 35, 40, 45, 50, 55.
35, 40, 45, 50, 55, 60.
25, 30, 35, 40, 45, 50, 55