## Normal Distribution Test

Unit Test #50

Select your answers to the following 10 questions from the pop-up menus in the right hand column. Clicking the "Begin Test Again" button will clear all the answers.

 Q1: What is the shape of the graph of a normal distribution? A. rectangularB. triangularC. bell-shapedD. bi-modal Answer 1: A                    B                    C                    D Q2: Approximately what percentage of values lie within two standard deviations of the mean of a normal distribution? A. 34%B. 68%C. 95%D. 99% Answer 2: A                    B                    C                    D Q3: A normal distribution has a mean of 10 and a standard deviation of 2. What is the probability that a value chosen at random is more than 10? A. 0.34B. 0.475 C. 0.495D. 0.5 Answer 3: A                    B                    C                    D Q4: For the distribution in question 3, what is the probability that a value chosen at random is less than 12? A. 0.34 B. 0.5C. 0.84D. 0.95 Answer 4: A                    B                    C                    D Q5: For the distribution in question 3, what is the probability that a value chosen at random is between 10 and 13? A. 0.5B. 0.4332C. 0.4987D. 0.9332 Answer 5: A                    B                    C                    D Q6: A distribution with the same mean, median and mode is always called a normaldistribution. A. TrueB. False Answer 6: A                    B                    C                    D Q7: What is the mean of the standard normal distribution? A. 0B. 0.5C. 1D. 50 Answer 7: A                    B                    C                    D Q8: Peoples' weights are normally distributed with a mean of 70 kg and a standard deviation of 10 kg. What percentage of people would have a weight between 60 kg and 80 kg? A. 34%B. 68%C. 95%D. 99% Answer 8: A                    B                    C                    D Q9: For the people in question 8, what percentage of people would have a weight greater than 45 kg A. 49.38B. 99.38 C. 49.50D. 99.50 Answer 9: A                    B                    C                    D Q10: What is the standard deviation of the standard normal distribution? A. 0B. 0.5C. 1D. 50 Answer 10: A                    B                    C                    D