# attached is an excel sheet with problems in regard to conditional probability

*label*Business Finance

*timer*Asked: Sep 14th, 2018

*account_balance_wallet*$15

### Question Description

Please see the attached excel file and answer the problems regarding conditional probability. Please answer the questions on the excel sheet them selves.

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## Tutor Answer

Attached.

Skill Qualification Task 5 -- Conditional Probability

The problems to submit are in red at the bottom.

Here is a site with several more examples:

http://www.mathgoodies.com/lessons/vol6/conditional.html

Here is the Gilmore Dining hall problem we looked at before:

Ate at Gilmore

dining hall

Yesterday

Did not eat at

Gilmore Yesterday

People surveyed who got violently ill yesterday

25

5

People surveyed who did not get violently ill

20

40

45

45

And repeated with the symbols for your convenience:

G

G'

S

25

5

S'

20

40

45

45

We have looked at simple (marginal) probability and joint (and, or) probability so far. Now let's consider CONDITIONAL probab

Suppose we look only at people who ate at Gilmore, highlighted in yellow above.

In that case, what is the probability that

group got sick?

That would be 25/45 or .556

The expression for that example would be: P(S|G) read: "The probability of S given G". This means to ask, "What is the proba

the person selected ate at Gilmore?"

Here's another example: What is the probability that a person did not eat at Gilmore, given the person got sick? Another way o

might be: "If we only look a...

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