Question

a pregnant woman learns she is having twins. assuming the probability of having a girl and a boy are the same, what is the probability that the twins are two girls? enter your answer as a percent to one decimal place, like this: 42.5%

Explanation:

Step1: List all possible outcomes

The possible combinations of twins are (boy, boy), (boy, girl), (girl, boy), (girl, girl). So there are 4 possible outcomes.

Step2: Determine favorable outcomes

The favorable outcome (two - girls) is 1 case.

Step3: Calculate the probability

The probability formula is $P=\frac{\text{Number of favorable outcomes}}{\text{Total number of outcomes}}$. So $P = \frac{1}{4}=0.25$.

Step4: Convert to percentage

To convert the decimal to a percentage, we multiply by 100. So $0.25\times100 = 25.0\%$.

Answer:

25.0%