Normal cut-offs Quiz
10 questions · easy to harder · University Statistics · score and step-by-step answers
How it works
- 10 questions, about 30 minutes (a timer counts down; you can hide it). Solve it right here: no sign-up.
- 5 questions have choices. For the others you type the answer: a number like 4, −2, 7/2 or 3.5, or for example x = 4, x = 2 or x = −3, (3, 5), 2x + 1. Use ^ for powers (x^2) and sqrt for √. Any form with the same value counts (7/2 = 3.5).
- One question at a time: Back, Next, Mark for review and the question list at the bottom. A calculator is on the screen.
- At the end: your percent and grade, every question right or wrong, why a wrong choice is wrong, and its step-by-step solution. Then practise the lesson with new questions.
Your answers and results are kept in this browser only, so you can close the page and come back.
1 Question 1
Normal mean 50, sd 10: value with 90% below it- A) 0.9
- B) 628
- C) 6.28
- D) 62.8
2 Question 2
Normal mean 100, sd 15: top 10%Type the answer.
3 Question 3
Normal mean 50, sd 10: value with 5% above it- A) 33.55
- B) 664.5
- C) 66.45
- D) 0.95
4 Question 4
Normal mean 80, sd 6: value with 50% below itType the answer.
5 Question 5
Normal mean 100, sd 10: top 2.5%- A) 11960
- B) 119.6
- C) 80.4
- D) 0.975
6 Question 6
Calculate 75th percentile, mean 500, sd 100Type the answer.
7 Question 7
Normal mean 75, sd 10: bottom 5%- A) 585.5
- B) 5.855
- C) 0.05
- D) 58.55
8 Question 8
Calculate 99th percentile, mean 100, sd 15Type the answer.
9 Question 9
Normal mean 64, sd 3: bottom 15%- A) 6.088
- B) 60.88
- C) 0.15
- D) 608.8
10 Question 10
Calculate 33rd percentile, mean 50, sd 10Type the answer.