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Practice Questions
Test your understanding with targeted questions related to the topic.
Question 1
Easy
Identify the mean and standard deviation if the data is: Mean = 50, Standard Deviation = 5.
π‘ Hint: Look at the parameters given directly.
Question 2
Easy
Convert a raw score of 90 to a Z-score if the mean is 80 and standard deviation is 10.
π‘ Hint: Use the Z-score formula when given X, mean, and standard deviation.
Practice 4 more questions and get performance evaluation
Interactive Quizzes
Engage in quick quizzes to reinforce what you've learned and check your comprehension.
Question 1
What does the Z-score tell you?
- Mean of the distribution
- Standard deviation
- How many standard deviations a score is from the mean
π‘ Hint: Remember, Z-scores help in standardizing various scores.
Question 2
True or False: The total area under the normal distribution curve is equal to 2.
- True
- False
π‘ Hint: Visualize the curve; it reflects total probability.
Solve 2 more questions and get performance evaluation
Challenge Problems
Push your limits with challenges.
Question 1
A factory's defect rate is normally distributed with a mean of 3 defects per 1000 units and a standard deviation of 1 defect. Find the probability that out of 1000 units, the defects will be fewer than 1.
π‘ Hint: Always convert raw scores to Z-scores before looking up the tables.
Question 2
In a population with a mean of 160 cm and a standard deviation of 20 cm, find the height at which 90% of individuals are below.
π‘ Hint: Look up the correct area in the Z-table and backtrack to find the raw data score.
Challenge and get performance evaluation