Consider 80 independent random variables all with the distribution given in problem 6. consider the random variable y obtained by adding together these 80 random variables. =++⋯+

a) what are the mean and standard deviation of y?
b) what is the probability y is less than 44?
c) find a number n such that there is only a 5% chance that y exceeds this number.

The answer is 1 because you have to flip the sign when dividing by negative number and 3

In all honesty, there really is no “work” per say to show. mainly it’s just using the process of elimination. the question is asking which domain(s) would be the most appropriate for the function c(n). n is the number of observed vehicles so right away, 1, 2, and 3 can be eliminated.why? 1, 2 start in the negatives and therefore it is impossible to observe negative cars. so, #4 would be the best answer to the given problem.

I  dont  know much about vertexes but i know to solve this function you need to use foil method and then corresponmd the vertex with the actual coordinates, hope i !