need answer with proccedure

After an exhaustive universityiwide student survey, it was found that the IQ scores of Brac University students follow a normal distribution with mean 103 and standard deviation 21 a. What is the probability that a randomly selected student will have an IQ score greater than 123? Answer in exact fraction, or rounded to at least 4 decimal places b. What is the probability that a randomly selected student will have an IQ score between 99 and 150? Answer in exact fraction, or rounded to at least 4 decimal places c. Faisal claims that his IQ score is better than 95.59% of all BracU students. What is the minimum IQ score Faisal should have for his claim to be valid?? Answer in exact fraction, or rounded to at least 2 decimal places