Q.Load the txhousing dataset from the ggplot2 package. Use the map command to calculate the average values of sales, volume, median, listings, and inventory. Compare the return from map and the map function designed for data frames.

Q. The function map_if applies a function to every element of a list provided it meets some specified criteria. Load the economics dataset in the ggplot2 package. Use select to remove the variable date and convert pop and unemploy to be in units 1 million using map_if.