Answer :
25% of the 9th grade belongs to more than one club.
9th grade population 180
1 club = 90
2 clubs = 33
3 or more clubs = 12
Students w/ clubs 135
2 clubs + 3 or more clubs = 33 + 12 = 45 ÷ 180 = 0.25 x 100% = 25%
1 club = 90 ÷ 180 = 0.50 x 100% = 50%
no club = 180 - 135 = 45 ÷ 180 = 0.25 x 100% = 25%
9th grade population 180
1 club = 90
2 clubs = 33
3 or more clubs = 12
Students w/ clubs 135
2 clubs + 3 or more clubs = 33 + 12 = 45 ÷ 180 = 0.25 x 100% = 25%
1 club = 90 ÷ 180 = 0.50 x 100% = 50%
no club = 180 - 135 = 45 ÷ 180 = 0.25 x 100% = 25%