Ten replicate analyses of the concentration of mercury in a sample of commercial gas condensate gave the following results: 23.3 22.5 21.9 21.5 19.9 21.3 21.7 23.8 22.6 24.7 ng ml−1 Calculate the...

Ten replicate analyses of the concentration of mercury in a sample of commercial gas condensate gave the following results:
23.3   22.5   21.9   21.5   19.9   21.3   21.7   23.8   22.6   24.7 ng ml−1

Calculate the mean, standard deviation, relative standard deviation and 99% confidence limits of the mean.