Find the mode of the observations 23, 27, 38, 42, 27, 58, 69, 71, 45. 

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RRB Group D 29 Aug 2022 Shift 3 Official Paper
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  1. 71
  2. 27
  3. 45
  4. 42

Answer (Detailed Solution Below)

Option 2 : 27
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Detailed Solution

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Given: 

observations 23, 27, 38, 42, 27, 58, 69, 71, 45.

Concept used:

The mode of a data set is the number that occurs most.

To easily find the mode, put the numbers in order from least to greatest and count how many times each number occurs.

The number that occurs most is the mode.

Calculation:

Arrange the numbers 23, 27, 38, 42, 27, 58, 69, 71, 45  in ascending order,

=> 23, 27, 27, 38, 42, 45, 58, 69, 71

In these the number 27 occurs two times then is mode 27.

Hence '27' is the correct answer.

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