Question

The cholesterol readings for people over seventy are said to be normally distributed with a mean of 215 and a standard deviation of 15.What would be the 75th percentile reading?

Answer 1

In this case, we'll have to carry out several steps to find the solution.

Step 01:

data:

mean = 215

standard deviation = 15

Step 02:

percentile:

75th percentile:

0.75 ===> z = 0.674

percentile value = mean + z * standard deviation

percentile value = 215 + (0.674)(15) = 225.11

The answer is:

225.11