E| 11 of 12 ID: MST.NDM.Mvs.06.oo1o [2 points] In a survey, 100 accountants were asked what they charge clients for one hour of consultation. The data are recorded in the following frequency distribution table: Amount charged ($) Frequency greater than 40 but less than 50 12 greater than 50 but less than 60 24 greater than 60 but less than 70 29 greater than 70 but less than 80 22 greater than 80 but less than 90 13 For the calculations below, use the value at the middle of each class to represent that class. As an example, for the class "greater than 40 but less than 50", use the value 45. 3) Approximate the mean amount charged from this summary. Give your answer in dollars and cents to the nearest cent. Mean g $ b) Approximate the standard deviation from this summary. Give your answer in dollars and cents to the nearest cent. Standard deviation z $