The mean of a set of observations is found by:
ATaking the middle value after sorting them
BDividing the sum of the values by how many there are
CTaking the value that occurs most often
DSubtracting the smallest value from the largest
Answer & Solution
Correct answer: B. Dividing the sum of the values by how many there are
1. The mean, also called the average, summarises a whole set with one number.
2. It is the sum of the values of all the observations divided by the total number of observations.
3. So both the total and the count are needed before it can be worked out.
4. The middle value after sorting is the median, and the most frequent value is the mode.
5. Largest minus smallest is the range, which measures spread rather than centre.
_Source: NCERT Class 10 Maths, Ch 13 'Statistics', S13.2 Mean of Grouped Data_
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