Table 1. Rotational Data

Radius (m)	Time per 15 revolutions (s)	Period (s)	Expected Value	Percent Error (%)
0.25	6.72s	0.448s	2.01	77.7%
0.40	7.99s	0.533	2.54	79.0%
0.15	5.87s	0.391	1.56	74.9%

I need help finding my expected value. I do not think I answered these correctly based on my answer in pre lab question 1.

Pre lab question 1: In this lab, you will be rotating a mass on one side of a string that is balanced by a second mass on the other end of the string (Figure 5). Apply Newton's Second Law of Motion to mass 1, m₁, and mass 2, m₂, to solve for the period of mass 1.

1.