A Random Sample of 4 Units Is Taken from a Group

question 62

Short Answer

A random sample of 4 units is taken from a group of 15 items in which 4 units are known to be defective. Assume that sampling occurs without replacement, and the random variable x represents the number of defective units found in the sample.
The mean of the random variable x is:
______________
The variance of the random variable x is:
______________
P(x = 0) = ______________
P(x = 1) = ______________
P(x = 2) = ______________
P(x = 3) = ______________
P(x = 4) = ______________

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Definitions:

Gain or Loss

The financial result that occurs when the selling price of an asset differs from its purchase price or adjusted basis, could be positive (gain) or negative (loss).

Bonds

Fixed income investment products that represent loans made by an investor to a borrower, typically corporate or governmental, which pays interest over a set period until maturity.

Repurchasing

The act of a company buying back its own shares from shareholders, reducing the amount of stock available on the open market.

Statement of Cash Flows

A financial statement that provides aggregate data regarding all cash inflows and outflows a company receives from its operating, investing, and financing activities.