course PHY 202
Image dist(cm)Object Dist(cm)Seperation(cm)1/Focus14100.171428571
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9.5 20 0.155263158
8.3 30 0.153815261
7.8 40 0.153205128
7.4 50 0.155135135
7.5 60 0.15
7.5 70 0.147619048
11.2 10 3.2 0.189285714
9.5 20 1.7 0.155263158
8.2 30 0.8 0.155284553
7.4 40 0.7 0.160135135
7.5 50 0.7 0.153333333
7.2 60 0.5 0.155555556
7.3 70 0.5 0.151272016
7.3 80 0.4 0.149486301
We didn't take sep. data for the first 9 trials."
Good. Since 1/f = 1/i + 1/o, your mean result of about .16 tells you that 1/f = .16, so that f = 1 / .16 = 6.7 or so.
Your measurements are in cm, so the focal length of this lens would be around 6.7 cm.
This is reasonably close to the 6.0 cm focal length of one of the packaged lenses, but not so close that we can be sure it really was one of those lenses and not another from my random collection.