Exercises on Measures of Central Tendency

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Exercises on Measures of Central Tendency
Enter
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There are seven multiple-choice questions in this
exercise. Click the letter to select the
corresponding answer.
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1. This is the frequency distribution of the ages
of students in a class.
Find out their mean age.
A
12
B
12.3
C
12.5
D
19
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Mean age
Bingo!
Next question
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12 is the mode, not the mean. Try again!
Hints
Return
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Sorry! You forgot to count the frequencies! Try
again!
Hints
Mean age ?
Return
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19 is the frequency of 12 year-old. That means
there are 19 students who are 12 years old. You
should be looking for the mean of the students
age. Try again!
Hints
Return
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2. This is the frequency distribution of the
weights of 50 members of a childrens choir.
Find out their mean weight.
A
50.5 kg
B
51.8 kg
C
56-60 kg
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Mean weight
Bingo!
Next question
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56-60 kg is the modal class, not the mean weight.
Try again!
Hints
Mean weight
Return
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Sorry! You forgot to count the frequencies. Try
again!
Hints
Mean weight ?
Return
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3. The table shows the number of mobile phones
owned by 100 families.
Find the mode.
A
4
B
4.5
C
5
38
D
13
Bingo!
Mode is the most frequent datum/data in a set of
data. Therefore
Mode 4
Next question
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5 is the mean of mobile phones owned by each
family, not the mode.
Try again!
Hints
Mode is the most frequent datum/data in a set of
data.
Return
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38 is the frequency of 4. That means there are
38 families that have 4 mobile phones. You
should be looking for the mode!
Try again!
Hints
Mode is the most frequent datum/data in a set of
data.
Return
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Sorry, your answer is wrong. Try again!
Hints
Mode is the most frequent data in a set of data.
Return
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4. This is the frequency distribution of the time
spent by Kelly on waiting for the bus last week.
Find the modal class.
A
6-10 minutes
B
8 minutes
C
12.9 minutes
D
11-15 and 16-20 minutes
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Bingo!
Modal class is the most frequent class in a set
of data. Therefore
Modal class 6-10 minutes
Next question
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12.9 is the mean of the time spent on waiting for
the bus, not the modal class.
Try again!
Hints
Modal class is the most frequent class in a set
of data.
Return
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8 is the class mark of the class 6-10 minutes.
You should be looking for the modal class of the
time spent by Kelly on waiting for the bus in the
past 40 days.
Try again!
Hints
Modal class is the most frequent class in a set
of data.
Return
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Sorry, your answer is wrong. Try again!
Hints
Modal class is the most frequent class in a set
of data.
Return
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5. This is the frequency distribution of the time
spent by 80 students in finishing a 3,000-meter
track.
Find the modal class.
A
15.3 minutes
B
16-20 and 31-35 minutes
C
21-25 and 26-30 minutes
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Bingo!
Modal class is the most frequent class in a set
of data. Therefore
Modal class 21-25 and 26-30 minutes
Next question
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15.3 minutes is the mean of the time needed to
finish a 3,000-meter track, not the modal class!
Try again!
Hints
Modal class is the most frequent class in a set
of data.
Return
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Sorry, your answer is wrong. Try again!
Hints
Modal class is the most frequent class in a set
of data.
Return
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6. This is the cumulative frequency polygon of
the salaries of a companys employees. Find the
median.
A
15000 dollars
B
15400 dollars
C
15800 dollars
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Bingo!
Since there are 90 employees in the company,
there median can be found at the 45th employee.
Therefore
Median15000 dollars
Next question
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Sorry, you didnt pay attention to the cumulative
number of employee.
Hints
Since there are 90 employees in the company,
there median can be found at the 45th employee.
Try again!
Return
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7. This is the cumulative frequency polygon of
rainfall in Island West during the past 40 days.
Find the median.
A
20 mm
B
70 mm
C
77 mm
D
85 mm
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Bingo!
The median of rainfall in 40 days can be found at
the 20th day. Therefore
Median 70 mm
End
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Sorry, you didnt pay attention to the cumulative
number of days. Try again!
Hints
The median of rainfall in 40 days can be found at
the 20th day.
Return
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The End