he tests marks of 14 students are displayed in a stem and leaf diagram, as shown below

0

1 2 6

2 1 3 5

3 w x 4 8 y z

4 6 7 7

Key: 1|6 means 16 marks

i. Find the lower quartile

ii. Given that the median is 32, find the values of w and

iii. Find the possible values of the upper quartile

iv. State one advantage of a stem and leaf diagram over a box and whisker plot