1.) Test one: meanis 80 and standard deviationis 9. Mark scores 91
Test two: mean is 77 and standard deviation is 6. Mark score 87
Find the percentilefor all
Which test Mark did better? Why?
2.) What is the the standard deviation for IQ tests? If someone’s IQ is 140, how many standard deviation is it above the mean?
The percentile can be calculated from a standard normal distribution table.
You can find one here: …
This solution helps explore the following questions:
How to compare distributions with different standard deviations?
How to compute standard deviation for IQ scores?