The monthly rents (in dollars) paid by 10 people are given below. (note that these are already ordered from least to greatest.)

820 , 955 , 980 , 1010 , 1020 , 1035 , 1050 , 1090 , 1115 , 1175

suppose that one of the people moves. his rent changes from $820 to $970 .

answer the following.

(a) what happens to the mean?
it decreases by $
it increases by $ or
it stays the same

(b) what happens to the median?
it decreases by $
it increases by $ or
it stays the same