Elective Mathematics

1In a normal distribution, about 68% of values lie within

2The scores of a test have mean 60 and SD 8. A score of 76 has a z-score of

3If X ~ N(100, 225), the standard deviation is

4About what percentage of a normal distribution lies within one standard deviation of the mean?

5A normal distribution curve is

6X ~ N(50, 16). Find P(X > 58) given P(Z < 2) = 0.9772.

7If X ~ N(50, 25), the standard deviation of X is

8A score of 70 comes from a normal distribution with mean 60 and standard deviation 5. What is its z-score?

9The z-score of a value 60 when μ = 50 and σ = 5 is

10About 95% of a normal distribution lies within