The following table gives the cumulative frequency distribution of annual incomes (in
thousands of dollars) for a sample of 200 families selected from a city.
Income ($1000's)
f
10 to less than 25
24
10 to less than 40
83
10 to less than 55
141
10 to less than 70
170
10 to less than 85
188
10 to less than 100
200
The cumulative relative frequency of the fourth class, rounded to two decimal places,
is:
The sample size is:
The percentage of families with an
income of less than $55,000, rounded to one decimal place, is: