15+Describing+data+(median+&+IQR+or+mean+and+standard+deviation)

Describing data (median & IQR or mean and standard deviation)

If the distribution of the data is normal than, to describe the data, you use median (middle number) and IQR (Q3-Q1). A normal distribution are symmetrical with a single central peak at the mean of the data. Fifty percent of the distribution lies to the left of the mean and fifty percent lies to the right of the mean. If the data is skewed you use mean (average) and standard deviation (z-score and sheet). A skewed distribution streches out further than the other.

[|Numerical Methods for Describing Data] [|Statistics and Probability Glossary] [|Explaining Standard Deviation]

__**Definitions**__

__**IQR**__-Interquartile Range

__**Mean**__-the average of the data set

__**Median**__-the middle number of the data set

__**Standard Deviation**__-quantity calculated to indicate the extent of deviation for a group as a whole

Solution: 34%
 * 1) The amount of time that Carlos plays video games in any given week is //normally distributed.// If Carlos plays video games an average of 20 hours per week, with a standard deviation of 3 hours, what is the probability of Carlos playing video games between 20 and 23 hours a week?

2.Which Car type tends to get the bes fuel efficiency? Second best? Worst? Solution: Best à small, Second Best à Family, Worst à luxury



3.



Mrs. Miles gave a test in her science class. What is the highest score on the test? What was the lowest score on the test? What was the median on the test? Solution: HIghest-->98, lowest-->36, median--> 73