Averages (Central Tendency)

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Questions 1 and 2

1. Find the mean average mark for the 60 students.

1 point

265200 marks

72 marks

68 marks

65 marks

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2. Two students are added to the year group and they score 23 and 51 marks respectively. Find the new mean average.

1 point

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3. Find the values of a, b, c, and d from the information given below.

1 point

a=9, b=9, c=11, d=23

a=9, b=9, c=9, d=25

a=9, b=9, c=10, d=23

a=9, b=9, c=10, c=24

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Questions 4 to 6. The following table shows the mathematics marks of 30 students. The mean average mark for the students is exactly a 4.

4. Find the value of k.

1 point

k=1

k=7

k=10

k=4

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5. Write down the mode.

1 point

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6. Find the median value.

1 point

3.5

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Questions 7 to 10. The table below shows the time taken, in seconds, by 100 students to do a task.

7. Write down the mid-point of the modal group.

1 point

37.5

32.5

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8. Find an estimate of the total number of minutes it took all 100 students to complete the test.

1 point

3822.5

3800

3900

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9. Why can we not find the mean, but instead find the estimate of the mean?

1 point

We do not have enough information

We do not know how many students took the test.

It is too difficult.

We do not know the exact number of seconds each student took

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10. Find an estimate of the mean time taken.

1 point

39.3

14.3

38.2

35.5

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