Question

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	20
greater than 50 but less than 60	22
greater than 60 but less than 70	26
greater than 70 but less than 80	22
greater than 80 but less than 90	10

a)Approximate the mean amount charged from this summary. Give your answer in dollars and cents to the nearest cent.

Mean ≈

b)Approximate the standard deviation from this summary. Give your answer in dollars and cents to the nearest cent.

Standard deviation ≈

Answer 1