Instructions: Given the scores of 40 students on their
100-item quiz in Mathematics, calculate the
approximate values of the specified measures of
position
1. Calculate Q2
2. Calculate D-
3. Calculate P20
Grades of 40 students in Mathematics (n=40)
Frequency
Class
interval
96-100
Lower
Boundaries
Cumulative
frequency
3
91-95
4
5
86-90
81-85
76-80
11
10
71-75
66-70
4
3
nonsense answer(report)
100-item quiz in Mathematics, calculate the
approximate values of the specified measures of
position
1. Calculate Q2
2. Calculate D-
3. Calculate P20
Grades of 40 students in Mathematics (n=40)
Frequency
Class
interval
96-100
Lower
Boundaries
Cumulative
frequency
3
91-95
4
5
86-90
81-85
76-80
11
10
71-75
66-70
4
3
nonsense answer(report)
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Answer:
LOWER BOUNDARIES
since the only things that we need to get is the lower boundaries, we only need to do is to subtract the lower limit to 0.5
96-0.5=95.5
91-0.5=90.5
86-0.5=85.5
81-0.5=80.5
76-0.5=75.5
71-0.6=70.5
66-0.5=65.5
COMULATIVE FREQUENCY
add only frequency by frequency
so the answers are
3
7
12
23
43
47
50