A group of 25 junior athletes participated in a javelin competition. They achieved the following distances in metres:
17.6 25.7 21.3 30.9 13.0 31.6 22.3 28.3 7.4
38.4 19.1 24.0 40.0 16.2 42.9 31.9 28.1 41.8
13.6 27.4 33.7 9.2 23.3 39.8 25.1
a. Choose suitable class intervals to group the data.
b. Organise the data in a frequency table.
c. Draw a frequency histogram to display the data.
d. Find the modal class.
e. What percentage of athletes threw the javelin 30 m or further?