Answer
The mean, obtained by adding all observations and dividing by the number of observations, is $-4.86.$
The median, representing the score under which we find $ 50\%$ of the observations, is $-4.85$
The mode, that is, the score appearing the most number of times in the dataset, is $-5$.
The mean and median are roughly the same number, so we can say that the distribution of the radioactivity levels is approximately symmetric.
Work Step by Step
See above.
