Dopamine is a chemical that plays a role in the transmission of signals in the brain. A pharmacologist measured the amount of dopamine in the brain of each of seven rats. The dopamine levels (nmoles/g) were as follows:

(a) Calculate the mean and SD.
(b) Determine the median and the interquartile range.
(c) Replace the observation 7.4 by 10.4 and repeat parts (a) and (b). Which of the descriptive measures display robustness and which do not?

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6.8 5.3 6.0 5.9 6.8 74 62