Duplicate of Intro to Percentiles and Normal Curves

Question 1

Given N(100, 10), what percent of observations are less than 114?

Accepted Answer

≈ 92%

Question 2

Given N(100, 1), what percent of observation fall between 70 and 130?

Accepted Answer

≈ 99.7%

Question 3

Given N(100, 10), what percent of observations are within 22 of the mean?

Accepted Answer

≈ 97%

Question 4

Given N(100, 10), what percent of observations are less than 90?

Accepted Answer

≈ 16%

Question 5

Given N(100, 10), what observation lies at the 95th percentile?

Accepted Answer

≈ 120

Question 6

Given N(100, 10), what is the lowest observation that falls in the top 15%?

Accepted Answer

≈ 110

Question 7

What % of observations in a normal distribution lie within two standard deviations of the mean?

Accepted Answer

≈ 95%

Questions 7