Statistics on the number of extracurricular interest groups in grade two: Math Group, Composition Group, Painting Group, Musical Instrument Group, Right Right Right Right Right Right Right Right Right Right Right Right Right Right Right Right Right Right Right Right Right Right Right Right Right Right Right Right Right Right Right Right Right Right Right Right Right Right Right Right Right Right Right Right Right Right Right Right Right Right right right right right right right right right right. Number of extracurricular interest groups in grade two: number of students in statistics group, mathematics group, composition group, painting group and musical instrument group 10 10 20 5 The bar chart is as follows:

(1) Each grid represents 2 people.

(2) The painting group has the largest number and the musical instrument group has the least number;

20-5= 15 (person);

The difference between the two groups is 15.

(3) Question: How many people are there in the extracurricular group?

10+ 10+20+5=45 (person);

A: There are 45 people in the extracurricular group.

So the answer is: 2, painting, musical instruments, 15.