Which best describes the mode of the data set?
{64, 65, 65, 67, 70, 71, 72, 75, 77, 78, 88, 91, 92, 93, 94, 95, 96, 97, 99}
O 78, because it is the value in the middle.
O 65, because it is the value that occurs most often.
O 19, because it is the number of values.
O 99, because it is the greatest value.