Calcuate the range, variance & standard deviation for this data series

Universal package service,ltd., delivers sm parcels to business addresses in the greater boston area. to learn more about data description on the # of deliveries/wk for a sample of 10 customers: 3 3 4 2 3 3 23 3  Calcuate the range, variance & standard deviation for this data series.  which measure does the best job of describing the dispersion in this variable?  Please show how answers were obtained-the arithmetic portion. thank you.