The number of hours of sleep of \(21\) students are shown in the frequency table below.
Hours of sleep | Number of Students |
|---|
\(4\) | \(2\) |
\(5\) | \(5\) |
\(6\) | \(4\) |
\(7\) | \(3\) |
\(8\) | \(4\) |
\(10\) | \(2\) |
\(12\) | \(1\) |
Find
the median;
the lower quartile;
the interquartile range.
