Stage 9 - Q9 - 4 marks
20165
Merge each neighbouring pair of classes in the table. Give the three new frequencies and their midpoint coordinates for a new polygon.
Time (min)
Frequency
\(10\le t<20\)
5
\(20\le t<30\)
6
\(30\le t<40\)
15
\(40\le t<50\)
5
\(50\le t<60\)
3
\(60\le t<70\)
6
Hint
Merging keeps every observation; it does not average frequencies.