hard · GMAT Quant
An industrial operations analyst monitors cycle times for two automated robotic arms, Arm 1 and Arm 2. Arm 1 completed 16 assembly cycles with a population variance of 20 seconds squared. Arm 2 completed 9 assembly cycles with a sample variance of 35 seconds squared. Assuming both robotic arms operate at the exact same mean cycle time
What is the population variance, in seconds squared, of the combined dataset of 25 assembly cycles?
- 23.20
- 24.00
- 24.60
- 25.00
- 25.40
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?