The grader randomly picks one answer, call it (I, J) , where I is the student ID number (taking values 1, ... , n) and J is the question number (taking values 1. ... , m). Assume that all answers are equally likely to be picked. Calculate the joint and the marginal PMFs of I and J

Will mark brainliest, , and rate to only chrislaurencelle clarissa made a scale drawing of a rectangle. she used a scale factor of 3 to draw the new rectangle. how does the length of the new rectangle compare to the original? the length of the new rectangle is 3 times shorter than the original. the length of the new rectangle is 12 times shorter than the original. the length of the new rectangle is 3 times longer than the original. the length of the new rectangle is 12 times longer than the original.