3 sums

Question 3 x? Xx ~ Nd d. If one randomly selected student is timed, find the probability that this student's time will be between 48 and 51 minutes. e. For the 44 students, find the probability that their average time studying is between 48 and 51 minutes. f. Find the probability that the randomly selected 44 students will have a total study time more than 2112 minutes. g. For part e) and f), is the assumption of normal necessary? O Yes No h. The top 15% of the total study time for groups of 44 students will be given a sticker that says "Great dedication". What is the least total time that a group can study and still receive a sticker? minutes