You are working as an office apprentice for the bksb newcastle arena. the arena is attempting to cut down on some of its running costs. look at the table below that lists the costs for the previous five years. year costs (£) year one 1.4 million year two 1.6 million year three 1.8 million year four 2.5 million year five 1.7 million what is the mean amount of costs?