If 30% of all twins are identical twins, what percentage of twins has the same gender? I thought: all identical twins have the same gender so it’s at least 30%. And of the non-identical twins it’s about 50%. So 50+30=80%?? Correct me if I’m wrong..?
- 30% of twins are identical
- 50% of non-identical twins have the same gender
Therefore 70% of twins are non-identical and 50% of those will have the same gender. I'll leave the rest of the calculation to you.