CIMA BA1 · Chapter 9 · Question 2 of 11
The weekly number of complaints received by a customer service team over seven weeks was: 12, 15, 9, 20, 15, 18, 11. What is the arithmetic mean number of complaints per week (to two decimal places)?
Test yourself: pick an answer
Reveal answer & explanation
Correct answer: B) 14.29
Explanation
Mean = sum of values / number of values = (12 + 15 + 9 + 20 + 15 + 18 + 11) / 7 = 100 / 7 = 14.29. The median and mode are both 15 and the range is 20 - 9 = 11.
More Summarising and analysing data MCQs
- Q4Treating the values 2, 4, 6, 8 and 10 as a complete population, what is their standard deviation (to two decimal places)?
- Q5A set of data has a mean of 40 and a standard deviation of 6. What is the coefficient of variation?
- Q6For a distribution that is positively skewed, which of the following relationships between the averages is usually expected?
- Q7Big data is commonly described by reference to which of the following characteristics?
- Q8A researcher divides a population of customers into groups by region and then selects a random sample from each region in proportion to…