# Thread: Probability Thanks: 0 Likes: 0

1. ## Probability

Hi, I'm quite new to excel and I need to find the probability of 3 different criteria. My criteria is finding the 'females' who live in 'london' and earn a net wage of 'greater than or equal to £495' can ANYONE help me with the command or formula I need to input to get the answer as I am loosing my mind!! Please! And thankyou in advance 😊

2. ## Re: Probability

Can you give some info on how your worksheet is structured, i.e. what are the columns, where is the data, etc?..

3. ## Re: Probability

You need to first split your 3 criterias. Calculate how many females over total people. I would use
Code:
`countif(A1:A99;"Female")/count(A1:A99)`
formula if people sex was in column A, from row 1 to 99. In another cell, calculate how many live in London using the same formula but with London. Third cell would be
Code:
`Countif(C1:C100;">=495")/count(C1:C99)`
if net salaries are in column C. You then multiply each percentage to get the probability it happens. You can calculate everything at once multiply directly but it is good to check each result the first time.

4. ## Re: Probability

Thankyou so much!!! I've been trying to do it all at the same time and it's just not going to work you're a diamond thankyou ��

5. ## Re: Probability

You are welcome. Thanks for the feedback.

6. ## Re: Probability

Two important things to remember about probability:

1. The probability of an event is a fraction: (#successful ways)/(# total ways)
2. The probability of TWO events both happening is an AND condition which requires multiplying the individual probabilities and
the probability of TWO events where EITHER could happen is an OR condition which requires adding the probabilities.

7. ## Re: Probability

Originally Posted by kweaver
Two important things to remember about probability:

1. The probability of an event is a fraction: (#successful ways)/(# total ways)
2. The probability of TWO events both happening is an AND condition which requires multiplying the individual probabilities and
the probability of TWO events where EITHER could happen is an OR condition which requires adding the probabilities.
Thankyou!!!

8. ## Re: Probability

You might want to look at a contingency table something like below.

Also, see this link

http://www.mathandstatistics.com/lea...and-dependence

 A B C D 1 >=495 <495 Total 2 Female London 3 Female Non-London 4 Male London 5 Male Non-London

Excel tables to the web >> Excel Jeanie HTML 4

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