THE NEXT QUESTIONS ARE BASED ON THE FOLLOWING:
The following table displays the joint probability distribution of two discrete random variables X and Y. 
-Compute the standard deviation for X.
Definitions:
Direct Labor-Hours
Direct labor-hours refer to the total number of hours worked by employees that are directly involved in the manufacturing process of a company's products.
Traditional Costing
A costing method that applies indirect costs to products based on a predetermined overhead rate, often not considering the actual activities that incur costs.
Overhead Assigned
The process of allocating manufacturing overhead costs to specific units of product based on a predetermined rate or method.
Product P9
A specific product or item identified as "P9," which could refer to a model or version in its respective context.
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