1. A college dean examines the cumulative grade-point averages of 120 sophomore students. The following frequency distribution is derived, using class intervals of width 0.3. 

Class interval Exact Limit f MP CF % c%

3.8-4.0 4

3.5-3.7 8

3.2-3.4 15

2.9-3.1 18

2.6-2.8 20

2.3-2.5 17

2.0-2.2 12

1.7-1.9 12

1.4-1.6 10

1.1-1.3 4

0.8-1.0 0

a. Complete the frequency distribution and construct the cumulative frequency distributions using the methods discussed in class (Exact limits, midpoints, freq, cum freq, percent, cum percent).

b. Draw a histogram and a frequency polygon for the distribution.

c. Find P10, P45, and P95. Show your work.

d. Find the percentile listed in c. using the ogive for this frequency distribution.

e.   Find the percentile rank of the cumulative grade point average of the following:  PR3.25 and P2.35.