Consider the following data on the estimated cost in millions of dollars resulting from traffic congestion for different urban areas. The dsta is for 13 largest u.s. urban cities. New York 15, Los Angeles 13, Chicago 7, Washington rv 5, Houston 5, Dallas ft worth 4, Detroit 4, miao 4, phoenix 4, Philadelphia 4, San Francisco 3, Boston 3, Altanta 3.

calculate the mean and standard deviaton for thi data set in millions of dollars.

delete the observation for New York and Los Angeles and recalculate the mean and deviation in millions of dollars.