if the weight of five puppies in kilograms are 3.5, 3.0, 4.2, 5.0 and 4.3, then mean weight of the puppies is?

if the coefficient of cross elasticity of demand for goods Y and Z is positive, the two goods are?

The difference between demand and wants is in the

A demand curve parallel to the Y-axis indicates

which of the following is an example of derived demand