With this test you will have been sent an Excel spreadsheet $($Data for Q$4)$

which contains results of reading of the activity of a long half$-$life species

$($so that the activity is nominally constant over the duration of reading.

Note post$-$collection the data has been sorted by value; The data$-$set is not

sequential in time.$)$

From the data in the spreadsheet, calculate:

$5\mathrm{.}1$ The mean activity

$5\mathrm{.}2$ The standard deviation of the activity

$5\mathrm{.}3$ The standard error of the mean of the activity

$5\mathrm{.}4$ The range in values of the activity

$5\mathrm{.}5$ The fractional number of values of activity within one standard deviation of the mean and the fractional number of values of activity within

two standard deviations of the mean.