data on oxygen consumption (mL/kg/min)

An article reported the following data on oxygen consumption (mL/kg/min) for a sample of ten firefighters performing a fire-suppression simulation:
29.9 49.8 30.7 28.3 28.8 25.4 33.7 29.5 23.1 30.5
Compute the following. (Round your answers to four decimal places.)(a) The sample range
mL/kg/min
(b) The sample variances2from the definition (i.e., by first computing deviations, then squaring them, etc.)
mL2/kg2/min2
(c) The sample standard deviation
mL/kg/min
(d)s2using the shortcut method
mL2/kg2/mi