What quartile is equivalent to the 50th percentile of a dataset?

Which quartile is also known as the lower quartile?

Which quartile represents the upper boundary of the middle 50% of a dataset?

Which quartile is also known as the upper quartile?

Which quartile corresponds to the 75th percentile of a dataset?

In a perfectly symmetrical distribution, where is the median in relation to the first and third quartiles?

In a negatively skewed distribution, where is the median in relation to the third quartile?

What quartile represents the lower boundary of the middle 50% of a dataset?

If the first quartile is 10 and the third quartile is 30, what is the interquartile range?

In a positively skewed distribution, where is the median in relation to the first quartile?