The mean is a measure of center. While it can be affected by adding new values ,the purchase of second deck would merely add more cards with the same values .As a result ,the mean would not change .Eliminate (C), (D),and (E). The standard deviation is a measure of sprees. As above, unique values will cause the standard deviation to change. However, since the new decks are identic -call to the old, the standard deviation will not change. Eliminate (B). 
A certain game uses a set of cards containing odd numbers. There are one 1, three 3s, two 5s, one 7, and three 9s. The mean value of this deck is 5.4, with a standard deviation of 2.8. If someone purchased three more decks of these cards and combined~them into single large deck, what would the new mean and standard deviation be? 

A) Mean = 5.4; standard deviation = 2.8 
B) Mean = 5.4; standard deviation = 2.95 
C) Mean = 16.2; standard deviation = 2.90 
D) Mean = 16.2; standard deviation = 8.4 
E) Mean = 21.6standard deviation = 11.2 