Stage 9 - Q4 - 4 marks
20210
Find each mean completion time to 1 decimal place. Compare which group is faster on average by this measure.
Group A
Stem
Group B
3
3
5
5
8
4
6
9
4
0
2
4
5
7
8
1
3
5
6
8
8
5
0
3
2
4
6
\(\text{A key: }3\mid 3=33\text{ s}\)
\(\text{B key: }3\mid 4=34\text{ s}\)
Hint
The number of leaves gives the divisor.