medium · GMAT Quant
A retail analyst evaluates customer spending at two store branches. Branch 1 serves 20 customers with a mean spend of $50 and an internal sum of squared deviations of 300. Branch 2 serves 30 customers with a mean spend of $60 and an internal sum of squared deviations of 450.
What is the total sum of squares (mathrmSST) for customer spending across both branches combined?
- 1,200
- 1,950
- 2,000
- 450
- 750
Sign up free to see the explanation and track your rank →
More GMAT Quant practice
- Including both endpoints, how many distinct integer price points are in this range?
- Which of the following expressions must result in a positive value?
- Which property of arithmetic justifies that first step?
- Which of the following must also be an even integer?
- Which of the following inequalities correctly represents this range?
- Which of the following includes the number 0?
- How many unique meal combinations can a customer create?
- What is the probability that the lightbulb is functional?