Question

Suppose people's systolic blood pressure were normally distributed with mean 130 mmHg and standard deviation 5 mmHg. Using the approximate EMPIRICAL RULE about what percentage of heights would be BELOW 125 mmHg ?

Question 8 options:

	About 99.7%
	About 97.5%
	About 95%
	About 84%
	About 68%
	About 47.5%
	About 34%
	About 20%
	About 16%
	About 13.5%
	About 2.5%
	Less than 1%
	No Answer within 1% Given

Answer 1

people's systolic blood pressure were normally distributed

Empirical rule state that 68%, 95% and 99% of the values lie within one, two and three standard deviations of the mean,

The proportion of the people with systolic blood pressure BELOW 125 mmHg is

There is 68% of the people within one standard deviation of the mean

That means there is 32% of the people that have systolic blood pressure greater than 1 standard deviation and below 1 standard deviation of the mean

since normal distribution is symmetric. This means 16% of the people have systolic BP less than 125 mmHg

Option i is right