# Thread: How to find mean and variation from information given?

1. ## How to find mean and variation from information given?

I am very lost, my teacher gives us a bunch of notes that make absolutely no sense to me.
This is the question im stuck on:
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41% of adults have experienced a breakup in the last 10 years. Of 9 randomly selected adults, find the probability that the number X, who have experienced a breakup at least once during the last 10 years.

a. probability that exactly 5 adults have experienced a breakup in last 10 years?

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i can figure out most of the problems ive been given sofar, but this one does not provide the mean and variation that i can use to find Z-scores etc.
Can someone please give me some help..

2. ## Re: How to find mean and variation from information given?

I know its in a homework-question format, im not looking for an answer. i just need someone to explain how i can find all the variables. the notes ive taken in class dont make sense to me and my teacher is not very helpful when he tries to explain.. this question just exemplifies the type of problems im having issues with.

3. ## Re: How to find mean and variation from information given?

This isn't a normal distribution problem. Use the binomial distribution instead.

4. ## Re: How to find mean and variation from information given?

.... i asked my teacher that and used this problem as my example for him as well. He said "its all covered in the chapter we are on, just read" ... the chapter we are on is covering normal distributions... asshat.
thanks Dason.

5. ## Re: How to find mean and variation from information given?

so, just to make sure im getting this right. when it asks for P(x<=5) i need to add up all values for P(X=x) up to x=5?

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