3. Mr Pearson carried out a survey to find how much time was needed by a group of students to complete their homework on a Thursday evening.
Number of
hours, h
osh < 0.5
0.5 sh< 1.0
1.0 1.5 30
22
19
8
Frequency
a) Does the modal class contain the median?
b) Estimate the mean (Hint: draw a table]