More on Normal Distributions

Question 1 out of 6.
A distribution has a mean of 40 and a standard deviation of 5. 68% of the distribution can be found between what two numbers?

 30 and 50

 0 and 45

 0 and 68

 35 and 45

Question 2 out of 6.
A distribution has a mean of 20 and a standard deviation of 3. Approximately 95% of the distribution can be found between what two numbers?

 17 and 23

 14 and 26

 10 and 30

 0 and 23

Question 3 out of 6.
A normal distribution has a mean of 5 and a standard deviation of 2. What proportion of the distribution is above 3?

Question 4 out of 6.
A normal distribution has a mean of 120 and a variance of 100. 35% of the area is below what number?

Question 5 out of 6.
A normal distribution of test scores has a mean of 38 and a standard deviation of 6. Everyone scoring at or above the 80th percentile gets placed in an advanced class. What is the cutoff score to get into the class?

Question 6 out of 6.
A normal distribution of test scores has a mean of 38 and a standard deviation of 6. What percent of the students scored between 30 and 45?