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Find the variance of the data…

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MATHS

Score(x)123456
Fre(f)57371167

Find the variance of the data

  • A. 4.69
  • B. 3.42
  • C. 4.85
  • D. 3.72

QUICK ANSWER…

D

SOLUTION 

Variance = average of the squared difference between each score and the mean score.

Find the variance of the data

Hence, variance = 171/46 = 3.72

Now for the right answer to the above question:

  1. Option A is incorrect.
  2. Option B is incorrect.
  3. C is incorrect.
  4. D is the correct answer.

QUICK TIPS…

You may please note these/this:

  • Variance is the average of the square of the deviation of each score from the mean.
  • To calculate variance:
  • We firstly find the mean,
  • Then subtract each score from the mean, and
  • Then square each of the answers gotten, and
  • Then multiply each of the squares with the corresponding frequency, and
  • Then sum them up, and
  • Finally divide this sum with the total frequency to get the variance.
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/ culled from 2019 JAMB-UTME mathematics question 15 /

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