i badly need your help, please :(

11. The GMAT scores of this year's test takers are normally distributed with a mean of 450 and a standard deviation of 25. a. Find the probability that a randomly selected test taker's score is at least 475. b. Find the probability that a randomly selected test taker's score is at most 400. c. Find the probability that a randomly selected test taker's score is between 425 and 525. d. Assuming that there are 5,000 test takers, how many got a score of more than 400. 12. The data below show the scores of 100 students in an English quarterly examination during S. Y. 2015-2016 g SY 2015-2016. 19 26 28 55 35 25 25 30 45 40 26 26 35 50 45 28 28 28 55 50 30 30 30 60 30 35 35 35 65 35 40 40 40 50 40 45 45 45 55 45 50 50 50 60 50 55 55 55 55 55 60 60 60 60 60 65 65 65 65 65 70 70 70 70 70 75 75 75 75 75 80 80 80 80 80 82 82 82 82 55 84 84 40 40 60 85 85 45 45 65 91 84 50 50 70 Assuming that the 75 55 60 65 70 scores are normally distributed, find Quezon City. ally distributed. find the follow 87 the following: a. mean (round off to the nearest whole number) b. standard deviation (round off to the nearest whole number) c. number of students within +-1 standard deviation from the mean value using empirical rule d. number of students within +-2 standard deviation from the mean value using empirical rule e. number of students whose score are greater than 46