I am really confused

Record Answer Question 3 (7 points) 3. Let Y = the number of siblings for a student at a local high school. Suppose we choose someone from the school at random. The probability distribution of Y is as follows. Y 0 2 3 4 5+ Probability 0.02 0.25 0.35 0.20 0.10 0.08 (a) Is Y a discrete or continuous? Explain. (b) Is this a valid probability distribution? Explain. (c) Create a histogram for the probability distribution and describe its shape. (d) Find the probability that the randomly selected student has at least one sibling. (e) Describe in words what P(Y>2) means and find the probability. (f) Calculate the mean of Y. Interpret this in context. (g) The standard deviation is 1.236. Interpret this in context