As explained at the end of section 2, the uncertainty of this data can be approximated as the square root of , where is the number of events (in this case, an event is the arrival of a spam email). Find the uncertainty of each of the four collections of events and express your answers as ± √.

Which two transformations are applied to pentagon abcde to create a'b'c'd'e'? (4 points) translated according to the rule (x, y) ? (x + 8, y + 2) and reflected across the x-axis translated according to the rule (x, y) ? (x + 2, y + 8) and reflected across the y-axis translated according to the rule (x, y) ? (x + 8, y + 2) and reflected across the y-axis translated according to the rule (x, y) ? (x + 2, y + 8) and reflected across the x-axis