Cluster — Grade 8 Math, what it means and where it is taught

A group of dots bunched together.

Taught in Grade 8 Math.

Where it is taught

Practise this idea

4 questions in the course bank use Cluster, in Scatter Plots & Association, Statistical Questions & Distributions.

Problem 1

As the age of a car increases, its value decreases. This is

  1. a negative association
  2. a positive association
  3. no association
  4. a cluster
Worked answer

a negative association

Opposite directions means negative

Problem 2

On a plot of height against weight, one point is far above the pattern. It is

  1. an outlier
  2. a cluster
  3. the median
  4. impossible
Worked answer

an outlier

It does not follow the trend of the rest

So it is an outlier

Problem 3

A point at the far right of a scatter plot lies exactly on the pattern. It is

  1. not an outlier
  2. an outlier
  3. the mean
  4. a cluster
Worked answer

not an outlier

This point follows the trend

So it is not an outlier, however extreme its x value

Problem 4

Scores are 78, 80, 81, 82, 30. Which is the outlier?

  1. 30
  2. 82
  3. 78
  4. There is none
Worked answer

30

The others cluster near 80

Elsewhere

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