Depending on if this makes an outlier, or if it is not. If it is then it will change the mean a good bit positive or negative depending on if it is it being a high or low outlier. The median will not be as effected by this new number because it will only move one point in either direction.
(D) If the null hypothesis is true, there is a 24% probability of getting a sample difference in means as far or farther below 0 as the difference found in the samples.Explanation: