Complete the table for calculating the period of a pendulum, given measurements of two time intervals (t1, t2) for a specific length (L).

✅ Correct.

Your calculations for tav, Period (T), and $T^2$ are consistent with the provided t1 and t2 values, allowing for typical experimental rounding.

Here is the filled table:

L (cm)	t1 (s)	t2 (s)	tav (s)	Period (T) (s)	T$^2$ (s$^2$)
40	12.78	12.63	12.69	1.27	1.61
50	14.12	14.28	14.20	1.42	2.02
60	15.50	15.63	15.56	1.56	2.43
70	16.75	16.85	16.80	1.68	2.82
80	17.90	18.00	17.95	1.80	3.24
90	18.95	19.07	19.03	1.90	3.61