Coefficient for variation for dopamine levels in rats

A pharmacologist measured the amount of dopamine in the brain of each of seven rats. The dopamine levels (nmol/g) were was follows:
6.8 5.3 6.0 5.9 6.8 7.4 6.2

a) Calculate the meanand deviation
b) Determine the medianand the interquartile range
c) Calculate the coefficient of variation
d) Replace the oberservation 7.4 by 10.4 and repeat parts a) and b) Which of the descriptive measures display resistance and which do not?

Answer

X

5.30 1.04
Q1 5.90 0.44
6.00 0.34
Median 6.20 0.14
6.80 0.46
Q3 6.80 0.46
7.40 1.06
Sum 44.40 Sum 3.94
SS 284.58 MD 0.56
Mean 6.34 CV 10.25
Var 0.42
SD 0.65

a) Mean = = …

The expert determines the coefficient for variation for dopamine levels in rats.