View Zoom Insert Chart Text Shape Media Comment Collaborate 23 .pdf Homework Assignment 3 Instructions: 1. Show your complete work. You may manually calculate or use Excel/PhStat. The PhStat output, if adequately labeled, is enough to meet the work required. 2. You may submit a word or excel file. Do not convert to pdf unless it is handwritten. Problem 1. 4 points The number of arrivals per minute at a bank located in the central business district of a large city was recorded over a period of 200 minutes, with the following results: Arrivals Frequency CS 0 10 Ethic 1 28 qn.pc 2 43 3 50 4 25 5 21 11 8 4 a. Compute the expected number of arrivals per minute. b. Compute the standard deviation problem 2. 8 points A student is taking a multiple-choice exam in which each question has five choices. Assume that the student has no knowledge of the correct answers to any of the questions. She has decided on a strategy in which she will place five balls (marked A, B, C, D and E) into a box. The marking on the ball will determine her answer to the question. There are 12 multiple choice questions on the exam. What is the probability that she will get: a. 11 questions correct? b. At least five questions correct? c. No more than 3 questions correct? d. At least 3 but no more than 8 questions are correct