two problems- help please

Lilian

New member
Joined
May 9, 2014
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4
Hi all,

I really need your help to solve these problems.

Thanks in advance.


 
Please share your work with us ...

If you are stuck at the beginning tell us and we'll start with the definitions.

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Hi,

I did solve the first one but I do not know what formula to use to solve problems of this nature in the second question. I can't decide which one will be used for.
 
I did solve the first one but I do not know what formula to use to solve problems of this nature in the second question.
Use the same method for the second part as for the first. Just, in this case, find the values for "none" and "exactly one", and subtract these from "1" (being "100%") to find the value for "at least two" (which means "anything other than none or one"). ;)
 
Hi all,

I really need your help to solve these problems.

Thanks in advance.



The second problem is an "expected value problem".

What formula you have been taught to calculate expected value?
 
The first requires only the "binomial" distribution: if each event has probability p of "success" the probability of i successes in n trials is \(\displaystyle P(i, n, q)=\frac{n!}{i!(n-i)!}p^i (1- p)^{n-i}\).
 
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