Astronauts visiting Planet X have a 250-cm-long string whose mass is 5.00 g. They tie the string to a support, stretch it horizontally over a pulley 2.00 m away, and hang a 4.00 kg mass on the free end. Then the astronauts begin to excite standing waves on the horizontal portion of the string. Their data are as follows:

m ....................................Frequency (Hz)
1 ..........................................31
2 ..........................................66
3 ..........................................95
4 ........................................130
5 ........................................162

Use the best-fit line of an appropriate graph to determine the value of g, the free-fall acceleration on Planet X.