So I then turned to the formula for calculating the period for a mass on a spring - 'T = 2pi * square root of m/k'. Now I thought, if I want to solve for K, I can simply take the average of the 'n' and 't' and do the following -

7.3335/3.74 = 6.28 * square root of 50/k

Where 7.3335 is the average oscillations and 3.74 is the average time. Now my question is, is this allowed? The reason why I thought this was allowed was that T = n/t, so why shouldn't n/t = 2pi * square root of m/k, as they are different ways to find the same thing? Correct? or am I wrong?

Thank you!