Need help please

Question 4: A student is faced with a two-question exam. A student believes that if they get a question correct, the probability of answering the next question correct increases but they don't know by how much. However, the student also believes if they incorrectly answer a question the probability of answering the next question incorrectly will also increase and be 40%. The probability of the student answering Question 1 correct is 0.60 and the probability of getting only one question correct is 0.48. To make marking simple both questions are worth only 1 mark each and there are no parts marks awarded. Let U be the number of total marks received for question 1. Let W be the number of total marks received for question 2. Here is a table use it only if it helps (it is not for marks) W = 0 W = 1 totals U = 0 U= 1 totals 1 Please use at least five digits after the decimal point if rounding. If there is not enough information to answer the question leave the boxes empty to ensure full marks a. What is the standard deviation for the expected number of marks earned for the exam? mark b. Find Cov(U, W) [1 mark] Answer C. Are U and W independent variables, Circle one: [1 mark] Yes No Not enough information determine