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A data has 25 observations arranged in a descending order. Which observation represents the median?
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If the number of observations is odd, then the median is `((n+1)/2)`ЁЭСбтДО observation.
Thus, `((25+1)/2)`=13ЁЭСбтДО observation represents the median.
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The mean of following numbers is 68. Find the value of ‘x’. 45, 52, 60, x, 69, 70, 26, 81 and 94. Hence, estimate the median.
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| Class | 1 – 5 | 6 – 10 | 11 – 15 | 16 – 20 | 21 – 25 | 26 – 30 | 31 – 35 | 35 – 40 | 40 – 45 |
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| No. of cars | 11 | 12 | 20 | 7 |
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| Weight (in nearest kg.) | No. of students |
| 46 | 7 |
| 48 | 5 |
| 50 | 8 |
| 52 | 12 |
| 53 | 10 |
| 54 | 2 |
| 55 | 1 |
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| Speed (km/h) | 85 – 100 | 100 – 115 | 115 – 130 | 130 – 145 |
| Number of cars | 5 | 8 | 13 | 9 |
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