1. Test marks for gr 10 course
12, 14, 4.5, 16, 22, 20, 11, 22, 19, 17
Mean = 15.75
SD = 5.52

2. Normal Distribution Curve

3. What percentage of students scored more than
21.27?
If there were 32 students in the class how many
would score more than 21.27?

4. What percentage of students earn between
4.71 and 21.27 on the test?

5. Government data indicates that the average
wage in the manufacturing job sector is $16
per hour with a standard deviation of $1.56
What percentage of people would earn $20.68 per
hour?
What percentage of people would earn more than
$12.88/hour?

8. When robins’ eggs are weighed, it turns out
that they vary according to approximately the
normal distribution with mean 17.5 mg and
standard deviation 3.5 mg.
What proportion of robins' eggs weigh between
10.5mg and 24.5 mg?
What is the mass of the smallest robins' eggs?

9. When robins’ eggs are weighed, it turns out that they vary according to
approximately the normal distribution with mean 17.5 mg and standard
deviation 3.5 mg.

10. Assignment #3
Page V­F­21
Questions 1 ­ 5