Question:easy
A study of blood pressure (BP) is done on 100 healthy individuals aged 25-27 years. The result is a normal distribution with median BP of 120 mm Hg. What percentage of the subjects will have a BP reading higher than 120?
A study of blood pressure (BP) is done on 100 healthy individuals aged 25-27 years. The result is a normal distribution with median BP of 120 mm Hg. What percentage of the subjects will have a BP reading higher than 120?
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In a normal distribution, mean = median = mode, and the curve splits exactly 50-50 about that centre value.
Updated On: Jul 8, 2026
- 25
- 50
- 75
- 100
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The Correct Option is B
Solution and Explanation
Step 1: Understanding the Concept:
Picture the normal curve as a symmetric hill. The median is the point straight under the peak, splitting the hill into two equal halves by area.
Step 2: Place the median on the hill.
We are told the median is 120 mm Hg, so 120 sits right under the peak of this particular hill.
Step 3: Read off the two halves.
Since the hill is symmetric, the slice to the left of 120 and the slice to the right of 120 carry equal area, each worth half of the total 100 subjects.
Step 4: Final Answer:
The right-hand slice, readings above 120 mm Hg, holds 50 subjects out of 100, so the answer is 50 percent.
Picture the normal curve as a symmetric hill. The median is the point straight under the peak, splitting the hill into two equal halves by area.
Step 2: Place the median on the hill.
We are told the median is 120 mm Hg, so 120 sits right under the peak of this particular hill.
Step 3: Read off the two halves.
Since the hill is symmetric, the slice to the left of 120 and the slice to the right of 120 carry equal area, each worth half of the total 100 subjects.
Step 4: Final Answer:
The right-hand slice, readings above 120 mm Hg, holds 50 subjects out of 100, so the answer is 50 percent.
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