How to find the cumulative distribution, mean, median & mode for this table

The cumulative GPA of graduating seniors at a small liberal arts college is shown in the following table.

GPA:

3.25-4.00
2.50-3.24
1.75-2.49
1.00-1.74
0.00-0.99

Interval Mean:

3.625
2.87
2.12
1.37
0.495

Percent:

23%
41%
19%
6%
11%

(i couldnt type it out in a table form, sorry!)

GPA:----------fri..........Fri.....Midpo…
3.25-4.00....0.23.....1.00......3.625
2.50-3.24....0.41.....0.77......2.87
1.75-2.49....0.19.....0.36......2.12
1.00-1.74....0.06.....0.17......1.37
0.00-0.99....0.11.....0.11......0.495
---------∑fri = 1

Mean = 3.625*0.23 + 2.87*0.41 + 2.12*0.19 + 1.37*0.06 + 0.495*0.11 = 2.55

The mode is on the interval 2.50-3.24; assume it's 2.87

The median is on the interval 2.50-3.24; asume it's 2.87