A certain standardized test's math scores have a bell-shaped distribution with a mean of 520 and a standard deviation of 114. Complete parts (a) through (c). (a) What percentage of standardized test scores is between 178 and 862? % (Round to one decimal place as needed.) (b) What percentage of standardized test scores is less than 178 or greater than 862? % (Round to one decimal place as needed.) (c) What percentage of standardized test scores is greater than 748? % (Round to one decimal place as needed.)