The dataframe for the years 1996-1998 is called assigned_years_league_df The variable 'elo_n' represents the relative skill of teams. Start by calculating the mean and the standard deviation of relative skill (ELO) in years 1996-1998. Calculate n that represents the sample size. Calculate the standard error which is equal to the standard deviation of Relative Skill (ELO) divided by the square root of the sample size n. Assuming that the population standard deviation is known, use Python methods for the Normal distribution to calculate the confidence interval. Your statistics should be rounded to two decimal places.