A dataset has 500 rows and 15 variables with 15% of the values missing, spread randomly throughout the records and variables. An analyst decides to remove rows that have at least one missing values. About how many row would she expect to remove?

Consider the simple 3-station assembly line illustrated below, where the 2 machines at station 1 are parallel, i.e., the product only needs to go through one of the 2 machines before proceeding to station 2.what is the throughput time of this process?