Marginal and Conditional Probabilities

 

 

What are the chances of choosing grape?

 

Def: Marginal Probability—the probability of a single event without consideration of any other event.

 

Def: Conditional Probability—the probability that an event will occur given that another event has already occurred.

 

            --probability of A given that B has occurred

 

Compute with Class Grape Data          

                                                           

 

Row by Window

Middle Row

Row by Door

Total

Grape

 

 

 

 

Not Grape

 

 

 

 

Total

 

 

 

 

 

 

P(middle row) = ?

P(not grape) = ?

P(not grapemiddle row)

P(middle rownot grape)

 

**Worksheet**

 

**Monty’s Dilemma**