Stat-101, Quiz 2
Majmaa’ah University
Engineering College
Stat 101
25/5/1432
Name:
Level 1
Academic Number:
Quiz (2)
1- The following data, gives the frequency distribution of the daily
commuting times (in minutes) from home to college for all 20 students of
level 5 at College of Engineering, Majmaah University.
Daily Commuting Time (minutes)
Number of Students
0 to less than 10
10 to less than 20
20 to less than 30
30 to less than 40
40 to less than 50
3
8
5
3
1
Calculate the Variance and Standard Deviation.
1
SaMeH
Stat-101, Quiz 2
2- The ages of 12 randomly selected students from a class are:
26, 21, 19, 27, 22, 20, 29, 19, 25, 21, 22, and 30. Find the mode
3- Select the correct answer that describes the following figure:
a) A histogram and frequency curve Skewed to the left
b) A histogram and frequency curve Skewed to the Right
c) A Symmetric histogram and frequency curve
4- The following are the ages of nine employees of a company:
47
28
39
51
33
37
24
33
59
a) Find the values of the three quartiles. Where does the age of 38 falls
in relation to the ages of these employees?
b) Find the interquartile range?
2
SaMeH