An auto parts chain asked customers to complete a survey rating the chain's customer service as average, above average, or below average. The following shows the results from the survey: Below Below Below Average Average Average Average Average Above Above Below Above Average Average Average Average Average Below Above Above Below Below Average Average Average Average Average Below Below Below Below Average Average Average Average Average Above Below Below Above Average Average Average Average Average The proportion of customers who felt the customer service was Average is the closest to O 0.20 O 0.28 O 0.50 O 0.52