he United States Bureau of Labor Statistics publishes various indexes that measure average prices of consumer goods in urban areas. The SAS data set called GAS contains data on the average price of unleaded regular gasoline $($per gallon$)$ for recent years by month in the United States. The variables in this file are year, month, and average gasoline price.

a$.$ Review the names, labels, and attributes of the variables in the SAS data set GAS. Record the label and variable type for GasPrice as a comment in your program.

b$.$ Identify the minimum and maximum gasoline price per year. Present the price statistics to two decimal places.

$45$c$.$ Create a new variable that represents the quarter of the year by applying a user$-$defined format to the Month variable in a DATA step.

d$.$ Using the data from part c$)$ calculate the average and standard deviation of gasoline prices per quarter per year. Present the price statistics to two decimal places.

e$.$ Create a SAS data set that contains the averages and standard deviations as calculated in part d$).$ Print the data set showing only the year, quarter, average price, and standard deviation. Present the price statistics with a dollar sign and two decimal places.