Grade 12 data management help would really be appreciated

7. The nurses' union collects data on the hours worked by operating-room nurses at the Statsville General Hospital. Hours Per Week Number of Employees 12 1 32 5 35 7 38 8 42 5 a) Determine the mean, variance, and standard deviation for the nurses' hours. b) Determine the median, interquartile range, and semi-interquartile range. c) Illustrate these data using a box-and- whisker plot