Now we can prepare table cumulative frequency distribution  Class-interval Frequency Cumulative frequency $$ 15-19$$ $$20-24$$ $$25-29$$ $$30-34$$ $$35-39$$ $$40-44$$ $$45-49$$ $$ 5$$ $$14$$ $$16$$ $$13$$ $$7$$ $$4$$ $$1$$ $$ 5$$ $$19$$ $$35$$ $$48$$ $$55$$ $$59$$ $$60$$