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India
Class XI

Centre or Spread ?

Interactive practice questions

The two dot plots below represent the scores of students from two classes in the most recent grade test.

 

a

Without performing any calculations, which class has the greater MAD?

Class A

A

Class B

B
b

If a student scored below their class average, in which class would they prefer to be?

Class A

A

Class B

B
Easy
< 1min

Consider the distribution of the data presented in this histogram.

Which of the following statements is true?

Easy
< 1min

In an entrance exam, applicants completed two papers.

On average, students performed better in Paper $1$1, but their marks were less spread out from the mean in Paper $2$2. The MAD of Paper $2$2 could be:

Easy
< 1min

Concerned that his heart rate was irregular, Derek’s doctor measured his heart rate (in beats per minute) $6$6 separate times in the space of an hour. They were:

$82,95,90,95,81,94$82,95,90,95,81,94

Easy
2min
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Outcomes

11.SP.S.1

Measure of dispersion; mean deviation, variance and standard deviation of ungrouped/grouped data. Analysis of frequency distributions with equal means but different variances.

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