- #1
JackLee
- 8
- 1
Homework Statement
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Given a group of 100 married couples, let X1 be the number of sons and X2 the number of daughters the couple has.
P(X1 = 0, X2 = 2) = f(0, 2) = 8 /100 = 0.08
2. Homework Equations
The Attempt at a Solution
I tried to look for a similar example online, I found this one:
for this one, there is 1 female and 37 male in math department and the table is making sense.
But for the first table, I am assuming the subscripts 0,1,2 are the number of boys/girls.
So I read the first column as: there are 6 married couple that have 0 boy and 0 girl, there are 15 couples with 0 boy and 2 girls. So P(X1 = 0, X2 = 2) = f(0, 2) should = 15/100, which is different from the given solution. Or was it a typo that X1 was meant to be the number of girls? then f(0, 2) = 8 /100 would makes sense.
I am so confused, please help