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Find the average of the series : 312, 162, 132, 142 and 122?

Correct answer: B. 174

  • A. 194
  • B. 174
  • C. 162
  • D. 186Computer Online Quiz

Explanation

Add the five numbers: 312 + 162 + 132 + 142 + 122 = 870. Dividing by 5 gives an average of 870 / 5 = 174. The likely trap is 194, which can result from an incorrect addition of the terms.

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About Averages

An average represents the total of a set of values divided by the number of values, and a weighted average gives different importance to different groups. Problems involve missing values, combined averages, replacement of observations, and changes in the average, so the total and count must be tracked separately.

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