An exam has 5 questions and each of them has 4 possible answers. a student gets 3 points for each correct answer and loses 1 point for each wrong answer. consider a student who answers all questions completely at random. let x denote the number of correct answers and y the number of points of this student at the end of the test. (a negative score is possible). (a) compute the mean and the standard deviation of y , µy and σy . (b) compute p(µy − σy ≤ y ≤ µy + σy ) and p(µy − 2σy ≤ y ≤ µy + 2σy ). (c) what is the probability that the student above gets a positive score?

Determine if the following statement is true or false. the normal curve is symmetric about its​ mean, mu. choose the best answer below. a. the statement is false. the normal curve is not symmetric about its​ mean, because the mean is the balancing point of the graph of the distribution. the median is the point where​ 50% of the area under the distribution is to the left and​ 50% to the right.​ therefore, the normal curve could only be symmetric about its​ median, not about its mean. b. the statement is true. the normal curve is a symmetric distribution with one​ peak, which means the​ mean, median, and mode are all equal.​ therefore, the normal curve is symmetric about the​ mean, mu. c. the statement is false. the mean is the balancing point for the graph of a​ distribution, and​ therefore, it is impossible for any distribution to be symmetric about the mean. d. the statement is true. the mean is the balancing point for the graph of a​ distribution, and​ therefore, all distributions are symmetric about the mean.

Jacob is graphing the line represented by the equation  −6x−5y=12.−6x−5y=12.  he first plots the  x-x-  and  y-interceptsy-intercepts  as follows.    which statement is correct regarding the intercepts on the graph?

Add. express your answer in simplest form. 12 9/10+2 2/3 = i need u guys to me find the answer to this question