Problem $4.$ Simple statistics

Consider the following sample of $30$ data points:

In R$,$ create an array that stores the above dataset. Derive the following values:

A$17=$ the sum of all data points

A$18=$ the sample mean

A$19=$ the unbiased estimator of the variance

A$20=$ the biased estimator of the variance

A$21=$ the unbiased estimator of standard error of the sample mean

Save A$17,..,$ A$21$ in A$17.$ dat, $...,$ A$21.$ dat using R$\text{'}$s command write.table$(...,$ col. names$=$FALSE, row.names$=$FALSE$).$