Can you please help me with these problems?

Questions 25-28 are related to the follogg A large group of students took a statistics test. The mean score, from the scale of 100, was 68.5 with a standard deviation of 8.2. The test scores have a bell-shaped distribution. 25 Students who scored less than 55 failed the test. a 0.0396 b 0.0495 c 0.0554 (1 0.0621 If the minimum score for the letter grade B is 74, what fraction of students received a grade 26 of B or higher. a 0.2514 b 0.2690 c 0.2852 (1 0.2966 2'7 If the range of scores for a C is 64-73, what fracti a 0.4177 b 0.4344 c 0.4518 (1 0.4698 What should the minimum score be set at so that a grade of A is given to the top 5% of test scores? [Round your answer to the nearest 28 integer.) a 79 b 82 c 86 d 90 Questions 29 and 30 are related A large number of students took a departmental math test, of whom 5 percent scored 90 or more from the scale of 100. The scores have a bell-shaped distribution with a standard deviation of 8.5. If the minimum score to pass the test is 60, what fraction of the 29 students failed the test? 0.0 5 08 0.04 2 3 0.0 3 5 3 0.0294 The middle interval which includes 95% of the test scores is to . [Round the scores to the nearest integer.) 59 93 61 91 63 89 65 87 The passenger car tires manufactured by 60321 59317 58313 57310 I. '3' Pnu'm w gna'mr-Ignu'm Question 32-35 are related Average speed on a freeway is 80 mph. Twenty-ve percent [25%] of vehicles drive 15 miles above the speed limit of 70 miles per hour. 32 What fraction of vehicles drive below the speed I a 0.1371 b 0.1192 C 0.1036 (1 0.0901 3 What fraction drive within :8 mph from the me: a 0.7817 b 0.7589 C 0.7368 (1 0.7154 34 What fraction drive within $1.5 standard deviati a 0.8979 b 0.8820 C 0.8664 (1 0.8494 The middle speed interval within which 95% of vehicles drive is to mph. [Round 35 your answers to the nearest integer.) 61 99 63 97 65 95 67 93 -U'B-l