The ratio of the number of atoms of the isotopes Ga-69 and Ga-71 in eight samples from different sources was measured in an effort to understand differences in reported values of the atomic mass of gallium.
sample Ga-69/Ga-71
1 1.52660
2 1.52974
3 1.52592
4 1.52731
5 1.52894
6 1.52804
7 1.52685
8 1.52793
Find the
a) mean
b) standard deviation
c) variance
d) write the mean and standard deviation together with an appropriate number of significant digits.