The mean is the average of all the values in a data set. To calculate the mean, we add up all the values and divide by the number of values. In this case, the mean for Q1 sales is ($2,000 + $3,000 + $4,000 + $2,500 +
$3,500) / 5 = $3,082.72 References: CompTIA Data+ Certification Exam Objectives, page 9