Which of the following statements is always true about the mean and the median of a data set that is perfectly symmetrical?

In a data set, the 25th percentile is also known as what?

Which measure of central tendency is most affected by extreme values in a data set?

In a data set, what does a decile represent?

What does the interquartile range (IQR) measure in a data set?

Which of the following best describes the mode of a data set?

In a normal distribution, what percentage of data falls within one standard deviation from the mean?

If the median of a data set is significantly higher than the mean, what can be inferred about the data's distribution?

Which of the following measures can be used to describe the variability in a data set?