I need help with these questions please

Use the following information to answer the 4 questions: Students taking a standardized test had a mean score of 75 and a standard deviation of 18. Assume that the scores are normally distributed. 1.) Find the probability that a student chosen at random scored less than 8 points 70 on the test. Round to the nearest ten-thousandth. * Your answer O This is a required question 2.) What percentage of students had a score between 70 and 95? Round 8 points to the nearest tenth of a percent. * Your answer This is a required question 3.) What is the lowest score a student could get to score in the top 20% of 8 points those that took it? *