# Percentiles of the Normal Curve

4 Questions

QUESTION 1 of 4

Hi Mr. McGuckian, I have a question. Why on the example 88.5 from chapter 5.3, which asks what the smallest 5% change in waist circumference has to draw the line on the bell curve on the right (due to the fact that the people who lost more would be on the negative, and on homework question #36 the top 2% of dieters (which I assume would be the ones who had more waist reduction) are drawn in the bell curve as the line on the right? Shouldn't this problem follow the same logic than example 88.5 and the people who had more waist reduction be on the left? I am confused. Thank you for your help. Adriana Nava

QUESTION 2 of 4

Hi Professor,

I have a question about something you said when using the z-table in reverse in section 5.3 you said look up the closest one on the table and if you get stuck in the middle like both are just as equal you add a 5? What do exactly do you add the 5 to? Can you further explain that trick?

QUESTION 3 of 4

Hello Professor,
I need help solving 43 in the homework of 5.3. I also don't understand 44. For 44, I got the answer 1.03, but the correct answer is 1.30.