Using the Hypergeometric distribution principle, the probability of X = 3 in the function is 0.4396
Defining an hypergeometric distribution function :

The parameters given :
- N = 15
- r = 4
- X = 3
- n = 10

Using Combination :
Recall : nCr = n! ÷ (n-r)!r!
Using a calculator :

Therefore, the probability of X = 3 in the hypergeometric function is 0.4396 (rounded to 4 decimal places).
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Depends on brand. can vary from a few hundred to more.
Answer
Sheridan should buy because doing so would save it $5900
Explanation
To determine the right course of action we will consider the relevant cost of making and buying
The relevant cost of making $
Variable cost ( 18 × 5,900 106200
Fixed cost (3× 5,900) <u> 17700
</u>
Total cost <u> 123,900</u>
Relevant of buying (20 × 5,900 ) = 118,000
Saving in cost by buying = 123,900 -118,000 =$5900
Answer
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Explanation
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