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Question
Find the median of first nine even natural numbers.
Solution
First nine even natural numbers are 2, 4, 6, 8, 10, 12, 14, 16, 18
Here, n = 9 ......(Odd)
∴ Median = Value of
= Value of
= Value of 5th observation
= 10
Hence, the median of first nine even natural numbers is 10.
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An incomplete frequency distribution is given below
| Variate | Frequency |
| 10 – 20 | 12 |
| 20 – 30 | 30 |
| 30 – 40 | ? |
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| 50 – 60 | 45 |
| 60 – 70 | 25 |
| 70 – 80 | 18 |
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