Option C is the correct answer because it creates an array 'top_scores' to store the top three scores and uses the 'sum' function to calculate the sum of those three scores. Options A, B, D, and E either incorrectly calculate the average of all scores within the group or incorrectly store and process the top three scores_ It is crucial to ensure that the array 'top_scores' is declared as '_temporary_' to avoid carrying the array over to the next student group.

The correct answers are A and E. Both of these statements use the 'SET' statement to correctly combine data from both 'SALES' and 'ORDERS' data sets. Option A combines data from both data sets in a single 'SET statement. Option E combines data from both data sets using two separate 'SET statements. Options B, C, and D are incorrect because they either do not specify the library or use incorrect syntax in the 'SET statement. The 'SET statement requires the data set name to be separated by a space or semicolon to combine multiple datasets.

The 'WHERE statement in PROC FREQ allows you to filter the data based on a condition before generating the table. Therefore, 'WHERE Gender='Female" filters the dataset to include only observations where 'Gender' is 'Female'- Options B and C are incorrect because they apply different filters. Option B filters for 'Male' and option C attempts to use a 'BY ' statement, which is not the appropriate way to filter data in PROC FREQ. Option D is incorrect because it uses 'IF which is not a valid statement for filtering in PROC FREQ Option E is incorrect because it filters for 'Female' AND 'Satisfied', which is not what the question requires.

Here's the explanation: , 1, extracts a substring from 'Product_Code' starting at position 1 (the first character) and continuing for 3 characters, resulting in the first 3 characters of the product code. Option B extracts only the 3rd character of the string. Option C extracts the substring starting from the 3rd character until the end of the string, which is not what's required. Option D extracts the substring starting from the 1st character and ending 3 characters before the end of the string, resulting in the first 3 characters being extracted. Option E is the correct answer. Only option A correctly extracts the first 3 characters.

Both options A and B achieve the desired result. Option A uses the 'TRIM' function to remove leading and trailing spaces from 'FIRST NAME and 'LAST NAME before concatenating them with a space, ensuring a clean full name. Option B utilizes the 'CATY function, which allows for concatenation with a specified delimiter (a space in this case). Both approaches ensure correct formatting and are valid solutions. Option C is incorrect because it does not handle potential spaces in the names. Options D and E are also incorrect because they either apply the concatenation without the date filter or use the 'year' function which doesn't handle the date comparison as accurately as the date literal.