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An industrial oven used to cure sand cores for a factory manufacturing engine blocks for small cars is able to maintain fairly constant temperatures. The temperature range of the oven follows a normal distribution, with a mean of 450F and a standard deviation of 25F. If the oven gets hotter than 475F, the core is defective, and the ideal range (i.e., that which yields the best quality output) is between 460 and 470F. What proportion of the output is expected to be of the "best" quality? % (round to 1 decimal place)