Please help me with Q 1&2

{1) Consider the following table: {a} (4pts) Explain why this is a probability distribution. {b} {Ems} Find the mean of the distribution. (in) (tints) Find the standard deviation of the distribution. {2) A researcher collects s random sample of EDD GCC students in order to estimate the proportion that have donated blood in the past. The researcher theu constructs a condence intetral: [1.15346234 <: p do not round off your answers here. what is the sample proportion margin of error>