Frank asked every teacher at his school how long it took them to travel to work. Frank's results are summarised in the summary statistics below.
n=70∑x=1587Sxx=4879 n = 70 \quad \sum x = 1587 \quad S_{xx} = 4879 n=70∑x=1587Sxx=4879Calculate the mean and the standard deviation for these data.
