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The sample mean is represented by x?. The formula for computing the sample mean is given as follows

Sample mean = Sum of all values/ Number of sample.

n = Number of sample

Example: - Last year’s incomes of five randomly selected families were

36,150 95,750 54,985 77,490 23,740

Find the sample mean.

Sample mean = Sum of all values/ Number of sample.

=(36150+95750+54985+77490+23740)/ 5 Since there are five sample

So n= 5

=288115/5

=57623

Therefore sample mean of this data set=

21 19 27 22 29 19 25 21 22 30

Find the sample mean.

The sample mean formula is

Sample mean = Sum of all values/ Number of sample.

=(21+19+27+22+29+19+25+21+22+30)/10 Since there are ten sample

So n= 10

= 235/ 10

=23.5

Therefore sample mean of this data set=