The records for all trains scheduled to depart from the Opera House train station last year showed that the average delay for these trains was 12.7 minutes, 17.1% of the trains had been delayed, and 15 trains had been cancelled. Mal is a traffic engineer helping the Opera House station improve its performance. She audited a random group of 50 records of trains scheduled to depart from the Opera House station last year. In her group the trains were late an average of 21.3 minutes, 32% of the trains had been delayed, and 2 trains had been cancelled. (a) For Mal's audit of train records, identify the population and the sample. X Population: The records of all the trains scheduled to depart from the Opera House station last year Sample: The random group of 50 records of trains audited by Mai (b) Choose whether each number described below is a parameter or a statistic for Mal's audit. Number Parameter Statistic The 15 cancelled trains among all trains scheduled to depart from the Opera House station last year O O The 17.1% of all trains scheduled to depart from the Opera House station last year that were late O O The 21.3-minute average delay among the random group audited by Mai O O