Engineering expenditures constitutes one of the important components of the cost of goods sold. A survey of the engineering expenditures (in millions of dollars) from the population of the largest 50 companies was conducted. The results of the survey are displayed in the character histogram presented below (expenditure figures are in millions of dollars). Histogram of expenditures

N = 50

Midpoint Count

27.5 5 *****

42.5 10 **********

57.5 13 *************

72.5 14 **************

87.5 8 ********

a) Calculate the median.

b) Calculate the standard deviation