Blood pressure values are often reported to the nearest 5 mmHg (100, 105, 110, e
ID: 3200766 • Letter: B
Question
Blood pressure values are often reported to the nearest 5 mmHg (100, 105, 110, etc.). Suppose the actual blood pressure values for nine randomly selected individuals are 118.6 127.4 138.4 130.0 113.7 122.0 108.3 131.5 133.2 What is the median of the reported blood pressure values? Suppose the blood pressure of the second individual is 127.6 rather than 127.4 (a small change in a single value). How does this affect the median of the reported values? What does this say about the sensitivity of the median to rounding or grouping in the data?Explanation / Answer
a. The median is the 127.4
How? It is the middle of all the values. It is like the 5th value, 4 smaller, 4 bigger than 127.4
b.
It says: It doesn't matter if the value is any value between the 4th and 6th , the median will remain the same i.e. 5th value.
So, the median is not effected if 127.6 is the number.