I'm trying to figure out the chance that two women with the same due date, give birth on the same day.
Do I just multiple the chance of giving birth on any given day for each woman, for each day, and add them together. For example, if the chance of giving birth at 39weeks 6days is 4%, 40 weeks is 5%, 40 weeks and 1 day is 4%, etc. The calculation would be: (...+ 0.04*0.04 + 0.05*0.05 + 0.04*0.04 +...)?
And if I wanted to know the chance for 3 women, I would do the same for woman1&woman2 + woman2&woman3 + woman1&woman3, and then add all 3 sums together?