Long term contracts for inputs can lead to the slow adjustment of input prices in response to changes in aggregate demand

If a number equal to the mean of a series of observations is added to the series, the new mean is:

A) smaller than the original mean. B) greater than the original mean. C) same as the original mean. D) either greater or smaller than the original mean depending on the number of observations in the series.

Which of the following statements is true?

A) Lower infant mortality rates are always a result of income growth in countries. B) Lower infant mortality rates are related to income growth in countries. C) The higher the income per capita, the higher the infant mortality rate. D) There is no correlation between income per capita and infant mortality rates.