GMAT Focus EditionData InsightsEasy
A production manager is reviewing the output data for two manufacturing lines, Line A and Line B. The manager wants to determine which line has a higher average daily output. The data for the last five days is as follows: Line A: 100, 110, 95, 105, 120 (units per day) Line B: 105, 100, 115, 90, 110 (units per day) Which line has a higher average daily output?
- ACannot be determined from the given data.
- BBoth lines have the same average daily output.
- CLine B
- DLine A
Show answer & explanationAnswer & explanation
Correct answer: B. Both lines have the same average daily output.
To find the average daily output for each line, sum the daily outputs and divide by the number of days (5). Line A: (100 + 110 + 95 + 105 + 120) / 5 = 530 / 5 = 106. Line B: (105 + 100 + 115 + 90 + 110) / 5 = 520 / 5 = 104. So, Line A has a higher average daily output. My previous answer C was incorrect, I will update the answer and explanation accordingly.
Why the other options are wrong
- A. The average can be determined from the given data.
- C. Line B has an average daily output of 104 units.
- D. Line A has an average daily output of 106 units, which is higher than Line B.
Arithmetic Mean
The arithmetic mean, or average, is a measure of central tendency calculated by summing all values in a dataset and dividing by the number of values.
- Most common type of average.
- Sensitive to outliers.
- Represents the 'balancing point' of the data.
Memory trick: Sum 'em up, then divide by the count!