Which of the following CANNOT be used as the name of a variable in R?  

Assume that the biological sex of a kid is either female or male, each with probability 0.5. The Smiths have two children. What is the probability that one child is a girl and the other is a boy?

If there were sufficient stock of product D, what would be the minimum planning horizon? And what if there were sufficient stock of product E?

The Supply Chain Management coordinates all the activities of the chain, starting with raw materials and ending with a satisfied customer.

Calculate the planning for the next 10 weeks for item B.

A product will always be in the same stage of its life cycle regardless of the country.

The Reorder Level is the inventory level that when reached, steps are taken to replenish the stored item.

Stock maintenance costs are included within the following costs: opportunity cost of capital; stock taking and inventory count costs; facilities and equipment costs; obsolescence costs; depreciation costs due to spoilage or expiration; insurance and tax costs; handling and transportation costs (collection, packaging and shipment) and fixed costs associated to production planners.

The marketing department receives the following 6 consecutive orders. Indicate which orders you can accept (or not) with rationale. First Order: 80 units for period 6.   Second Order: 20 units for period 1.   Third Order: 15 units for period 3.   Fourth Order: 30 units for period 2.   Fifth Order: 50 units for period 8.   Sixth Order: 80 units for period 10.

Name one type of novel that was popular during the Romantic period.