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Error in calculation

Posted on 2016-07-19
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Can you please help me in the calculation?  Thanks.

A successful barbeque chain sells its​ beef, pork, and chicken items to three kinds of​ customers: dine-in,​ delivery, and pickup. Last​ year's sales showed that 12,766 orders were​ dine-in (d), 5,896 were delivery orders​  (e), and 3,124 orders were pickup​ (p). Suppose an audit of last​ year's sales is being conducted.

a. If a customer order is selected at​ random, what is the probability it will be a pickup ​order?
Pickup = 3124 / 12766+5896+3124

b. If two customer orders are selected at​ random, list the sample space indicating the type of order for both
 ​(d, e),​ (d, p),​ (e, d),​ (e, p),​ (p, d),​ (p, e)
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Question by:mustish1
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d-glitch earned 500 total points
ID: 41719552
a looks correct, although you should have parentheses around the three terms in the denominator.

b is wrong unless the order of the orders matters.  Is (d, e) different from (e, d)??  
And what about (d, d) and (e, e) and (p, p)??  They are certainly possible.
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by:mustish1
ID: 41719558
​(d, d),​ (d, e),​ (d, p),​ (e, d),​ (e, e),​ (e, p),​ (p, d),​ (p, e),​ (p, p)
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by:mustish1
ID: 41719560
Thanks.
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