Home › Kerala SSLC (Class 10) › mathematics › Statistics › If 25 children are sorted by haemoglobin levels …
If 25 children are sorted by haemoglobin levels with counts (2, 3, 5, 6, 4, 3, 2) at the levels (12.0, 12.4, 12.7, 13.1, 13.3, 13.6, 14.0) g/dl, the median haemoglobin (the 13th child's level) is:
Answer & Solution
Correct answer: C.
1. Cumulative counts: 2 (level 12.0), 5 (12.4), 10 (12.7), 16 (13.1), 20 (13.3), 23 (13.6), 25 (14.0).
2. The 13th child falls in the level whose cumulative count first reaches or exceeds 13.
3. After level 12.7 the cumulative count is 10 (below 13); after level 13.1 it is 16 (≥ 13).
4. So the 13th child's haemoglobin reading is 13.1 g/dl.
5. Hence the median haemoglobin level is 13.1 g/dl.
_Source: SCERT Kerala Std X Mathematics Part-2, Chapter 9-11 (pp 227-246, 2019 ed.)._
Related questions
In the rainfall data for 14 Kerala districts during a week of September 2015, the value 89For a set of numbers in arithmetic sequence, which statement about the mean and median is For 10 values, with the high-income household excluded, the median monthly income is foundThe median of the eleven monthly incomes (with the high-income household included) equals:If one new household with a monthly income of 175 000 rupees joins the same neighbourhood,The monthly incomes of 10 households (in rupees) are 16500, 21700, 18600, 21050, 19500, 17Variance of constants is:Range of 10, 25, 40, 18, 7: