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SS1: Economics – Measure of Central Tendency | Theory Questions

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Question 1

Find the arithmetic mean, mode, and median

Arithmetic Mean = \( \frac{\sum fx}{\sum f} \\ = \frac{3900}{20} \\ \scriptsize \bar{x} = 195 \)

Mode = 180 because it is the number with highest frequency and it appears 8 times

Arrange in ascending order

90, 90, 180, 180, 180, 180, 180, 180, 180, 180, 210, 210, 210, 210, 240, 240, 240, 240, 240, 240

∴ Median = \( \frac{180 \; + \; 210}{2} \\ = \frac{390}{2} \\ = \scriptsize 195 \)

Question 2

Importance of a Table

  1. It serves as a basis for plotting graphs.
  2. It shows the relationship between two or more variables.
  3. It makes information neater.
  4. It makes data to be easily understood when represented in a table form.
  5. It avoids confusion and repetition of figures.
  6. Figures can be observed at a glance through a table.

Question 3

Guidelines to draw a Graph

  1. The graph must be titled or headed clearly.
  2. The vertical side of a graph is denoted by Y and read as Y-axis while the horizontal side is denoted as X and read as X-axis.

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