Question

A marketing research found out that there was an increase in purchases over the Christmas period in 2015 compared to 2014. Using the data below, calculate the mean percentage increase in purchases. 20.2 4.1 6.9 8.0 4.7 3.9 7.8 8.3 9.2 5.3 Please give your answer to two decimal places.

Answer 1

Given :- A marketing research found out that there was an increase in purchases over the Christmas period in 2015 compared to 2014 . Data :- 20.2 4.1 6.9 8.0 4.7 3.9 7.8 8.3 9.2 5.3 .

To Find :- calculate the mean percentage increase in purchases ?

Answer :-

→ Total increase in purchase = 20.2 + 4.1 + 6.9 + 8.0 + 4.7 + 3.9 + 7.8 + 8.3 + 9.2 + 5.3 = 78.4 %

and,

→ Number of intervals % increase in purchase = 10 .

we know that,

• Mean = Sum of all observations / Total number of observations .

so,

→ Mean % increase in purchase = Total increase in purchase / Total Number of intervals = 78.4/10 = 7.84% (Ans.)

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