With reference to the following article:
There is an example under the head What is a Decision Tree ? How does it work ? which states that there are 30 students with three variables Gender (Boy/ Girl), Class( IX/ X) and Height (5 to 6 ft). 15 out of these 30 play cricket in leisure time. Estimate who will play cricket?
in the first step while splitting on gender we have worked out that out of 30 students there are 10 females ( 2 play cricket )and 20 males(13 play cricket. Can someone tell me how has this math been worked out