Heart disease was the leading cause of death for women in the united states, killing 292,188 women in 2009-that was approximately one in every four female deaths. what is the chance of two non-related women in a row both having heart disease

Heart disease was approximately one in every four female deaths, so you can say the chance of getting heart disease is 1/4. The event in this problem should be independent. So, the calculation of the chance would be:

chance = woman1 risk * woman2 risk

chance = 1/4 * 1/4 = 1/16 = 6.25%