The following data represents the shrinkage rates $($in $\%)$ of concrete samples: $0\mathrm{.}02,0\mathrm{.}03,0\mathrm{.}01,0\mathrm{.}04,0\mathrm{.}02,0\mathrm{.}03,0\mathrm{.}01,0\mathrm{.}05.$

Calculate the following and round to the fourth decimal place:

a$)$ Calculate the mean shrinkage rate:

b$)$ Calculate the variance of the shrinkage rates:

c$)$ Calculate the standard deviation of the shrinkage rates:

d$)$ Calculate the skewness of the shrinkage rates:

e$)$ Calculate the kurtosis of the shrinkage rates: