1. The problem asks for the fraction of tennis club members who are aged 30 to 39 years old. 2. From the graph description, the Tennis club has: - Members aged 20 to 29: 6 - Members aged 30 to 39: 8 - Members aged 40 to 49: 4 - Members aged 50+: 2 3. Calculate the total number of tennis club members: $$6 + 8 + 4 + 2 = 20$$ 4. We want the fraction who are aged 30 to 39, which is $$\frac{8}{20}$$. 5. Simplify the fraction by dividing numerator and denominator by their greatest common divisor, which is 4: $$\frac{8 \div 4}{20 \div 4} = \frac{2}{5}$$ 6. Therefore, \boxed{\frac{2}{5}} of tennis club members are aged 30 to 39 years old.