In finding the mean value of V from the table, the sets are all given the
same weight. The difference between the result thus obtained and that from
any system of weights is small, and may be neglected.

The following table gives the result of different groupings of sets of
observations. Necessarily some of the groups include others:

Electric light (1 set) 299850
Set micrometer counting oscillations (2) 299840
Readings taken by Lieutenant Nazro (3) 299830
Readings taken by Mr. Clason (5) 299860
Mirror inverted (8) 299840
Speed of rotation, 192 (7) 299990
Speed of rotation, 128 (1) 299800
Speed of rotation, 96 (1) 299810
Speed of rotation, 64 (1) 299870
Radius, 28.5 feet (54) 299870
Radius, 33.3 feet (46) 299830
Highest temperature, 90° Fahr. (5) 299910
Mean of lowest temperatures, 60° Fahr. (7) 299800
Image, good (46) 299860
Image, fair (39) 299860
Image, poor (15) 299810
Frame, inclined (5) 299960
Greatest value 300070
Least value 299650
Mean value 299852
Average difference from mean 60
Value found for π 3.26