STATISTICS AND
PROBABILITY
1 st . STATISTICAL STUDY. The marks of a group of 20 students in the
last math test were:
5 1 9 7 2 3 5
6 8 4 7 9 7 7
2 7 3 9 5 5
Answer the following questions:
� � which is the statistical variable of the study? ……………………………………�
� is it a qualitative, discreet quantitative or continuous quantitative variable?
……………………………………………………………………………………………………………………………………�
� � which is the population of the statistical study? ………………………………..�
� which is the population size? ………………………………………………………………………�
� Complete this statistical board:�
f
Fi
xi
i
hi
cumulative
math mark abs. frequency rel. frequency
abs. frequency
1
2
3
4
5
6
7
8
9
TOTAL
% x i � f i
�
Draw a bar chart to represent the statistical distribution of absolute
frequencies.�