Frequency Distribution Table of the interval scores of the grade 10 history achievement test.

x	f	cf	c%
76-80	3	30	100%
70-75	1	27	90%
65-69	1	26	86.67%
60-64	6	25	83.33%
55-59	11	19	63.33%
50-54	4	8	26.67%
45-49	3	4	13.33%
40-40	1	1	3.33%

1. Based on thef-distribution table of the scores grouped according to class intervals above:

Find the Median. (Hint: Use the formula in the course Study Guide.) (6 pts)

2. Based on thef-distribution table of scores grouped according to class intervals above find the:

Q1 (6 pts)

Q3 (6 pts)

Interquartile range (1 pt)

Semi-interquartile range (1 pt)