UPSKILL MATH PLUS
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Learn more1. The following data gives the number of residents in an area based on their age. Find the average age of the residents. (using direct method)
| Age | \(0 - 10\) | \(10 - 20\) | \(20 - 30\) | \(30 - 40\) | \(40 - 50\) | \(50 - 60\) |
| Number of residents | \(2\) | \(6\) | \(9\) | \(7\) | \(4\) | \(2\) |
Answer:
The average age \(=\)
2. Find the mean for the following frequency table: (using assumed mean method)
| Class Interval | \(100 - 120\) | \(120 - 140\) | \(140 - 160\) | \(160 - 180\) | \(180 - 200\) | \(200 - 220\) | \(220 - 240\) |
| Frequency | \(10\) | \(8\) | \(4\) | \(4\) | \(3\) | \(1\) | \(2\) |
Answer:
The mean \(=\)
(Note: Round off the answer to \(3\) decimal places.)
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