The table shows the height, in cm, of 80 plants in a garden.

Height (cm)	60-64	65-69	70-74	75-79	80-84	85-89
Frequency	8	13	17	24	11	7

(a)        Calculate the mean height, correct to 1 decimal place.
(b)        Construct a cumulative frequency table.
( c)       Draw a cumulative frequency curve. Use your curve to estimate the median height, correct to 1 decimal place.

OBSERVATION

The question was also very popular among the candidates and a majority did well and scored high marks.  However, it was also observed that some candidates used the class mid point instead of the class-boundaries to draw the Ogive which is wrong.  Some others were unable to read the median from the graph and hence, they lost some marks.