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FILE HOME INSERT PAGE LAYOUT FORMULAS DATA REVIEW VIEW J68 X v f A B C D E F G H K 229 A large group of students took a statistics test. 230 The mean score, from the scale of 100, was 75.2 with a standard deviation of 7.45 231 The test scores have a bell-shaped distribution. 232 25 Students who scored less than 60 failed the test. 233 What fraction of students failed the test? 234 a 0.0207 235 b 0.0275 236 0.0367 237 0.0490 238 239 26 In the previous question, 95% of test scores are within : from the mean test score. 240 a 16.9 241 16.1 242 15.3 243 d 14.6 244 245 27 If the range of scores for a C is 68 to 78 246 what fraction of students received a C? 247 a 0.5187 248 b 0.4988 249 C 0.4796 d 0.4611 251 252 28 If the minimum score for the letter grade B is 79 what fraction of students received a grade of B or higher. D54 0.3050 155 0.2877 0.2715 0.2561 258 259 29 What should the minimum score at so that a grade of A is given to the top 7.5% of test scores? 260 a 89 261 88 262 C 86 263 84 264 E270 HWB