Question

This two-way frequency table gives the results of a screening test for heart disease conducted by determining the cholesterol level in the blood

samples of 750 patients.
Question 1
Using the two-frequency table, compute the probability of having high cholesterol. Or Phigh cholesterol)

Answer 1

The probability of having high cholesterol = 0.496

Explanation:

Given frequency data table

cholesterol level

Normal High Total

Heart diseases Yes 11 223 234

No 367 149 516

Total 378 372 750

Given data

The Cholesterol level is high n ( High cholesterol) = 372

Total n( S) = 750

The probability of having high cholesterol level

P( E) =
`(n(E))/(n(S)) = (372)/(750) = 0.496`