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donnafranks2003
18.02.2020 •
Mathematics
For a certain animal, suppose that the number of babies born is independent for each pregnancy. this animal has a 70% chance of having one baby and a 30% chance of having 2 babies at each pregnancy. let X be a random variable that represents the total number of babies if the animal gets pregnant twice. construct a table showing the probability distribution of X.
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Ответ:
Step-by-step explanation:
This is the equation that you started off with:
(x - z -
)(x + z +
)
You can't really use FOIL on this because that's used in multiplying binomials, and this is a trinomial, but you can still break it up and simplify it this way:
(a + b + c)*(d + e + f) = (a(d + e +f)) + (b(d + e + f)) + (c(d + e + f))
So, applying that idea to the actual equation:
x(x + z +
) -z(x + z +
) -
(x + z +
)
= x^2 + xz + x
-xz -z^2 - z
- x
- z
- 5
= x^2 - z^2 - 2z
- 5
or![x^{2} - z^{2} - 2z\sqrt{5} - 5](/tpl/images/1196/8969/994ba.png)