Ryan measured the heights of 87 randomly selected boys at his school. His results are summarised alongside.
Height ( h cm)
Frequency
140≤h<150
1
150≤h<160
13
160≤h<170
40
170≤h<180
30
180≤h<190
3
Total
87
a. Calculate the relative frequency of each class interval.
b. What percentage of boys measured between 160 cm and 180 cm?
c. Construct a histogram to display the data.
d. Identify the modal class.
e. Describe the distribution of the data.