Design a Python function that accepts a variable number of arguments and returns their sum. Ensure the function can handle both positional and keyword arguments. Provide examples demonstrating its usage.

Develop a data analysis tool using Python that accepts a list of numeric values as input. Implement functions to calculate various statistical measures such as mean, median, mode, and standard deviation. Utilize dictionaries to store the results for easy access.

Design a Python program to create an inventory management system for a retail store. Utilize dictionaries to store item names as keys and corresponding quantities as values. Implement functions to add new items, update quantities, and generate reports such as low stock alerts.

Create a weather$-$tracking application. Define a list to store daily temperature data for a week. Each element should be a dictionary representing a day with keys such as date, high temperature, low temperature, and weather conditions. Implement functions to calculate the average temperature for the week and find the day with the highest temperature.

Develop a software application for a savings and loans company. Define a set of variables that store the following information: customer's name, account balance, account type $($e$.$g$.,$ savings, checking$),$ and transaction history.