Medicare's new medical plans offer a wide range of variations and choices for seniors when picking a drug plan. The monthly cost for a stand-alone drug plan varies from plan to plan and from state to state. The accompanying table gives the premium for the plan with the lowest cost for each state.

State	Cost per Month (dollars)
Alabama	6.41
Alaska	8.63
Arizona	17.83
Arkansas	4.04
California	7.57
Colorado	14.04
Connecticut	12.95
Delaware	9.03
District of Columbia	6.83
Florida	11.87
Georgia	16.99
Hawaii	17.03
Idaho	5.86
Illinois	16.92
Indiana	9.85
Iowa	13.42
Kansas	8.02
Kentucky	6.75
Louisiana	10.38
Maine	3.31
Maryland	1.87
Massachusetts	8.99
Michigan	8.87
Minnesota	12.19
Mississippi	1.87
Missouri	6.47
Montana	7.34
Nebraska	18.21
Nevada	8.49
New Hampshire	7.33
New Jersey	8.25
New Mexico	10.04
New York	10.60
North Carolina	14.29
North Dakota	9.51
Ohio	1.87
Oklahoma	1.87
Oregon	8.52
Pennsylvania	11.09
Rhode Island	12.32
South Carolina	1.87
South Dakota	13.57
Tennessee	7.72
Texas	18.20
Utah	1.87
Vermont	20.19
Virginia	1.87
Washington	9.11
West Virginia	13.36
Wisconsin	8.59
Wyoming	10.43

(a) Use class intervals of $0 to <$3, $3 to <$6, $6 to <$9, etc., to create a relative frequency distribution for these data. (Round your answers for relative frequency to four decimal places.)

Class Interval	Frequency	Relative Frequency
$0 - <$3
$3 - <$6	3	0.0588
$6 - <$9
$9 - <$12
$12- <$15
$15 - <$18	4	0.0784
$18 - <$21	3	0.0588
TOTAL	51

(c) Using the relative frequency distribution or the histogram, estimate the proportion of the states that have a minimum monthly cost of less than $12.00 a month. (Round your answer to one decimal place.)
%