Which statement below is incorrect? the mean is not affected by the existence of an outlier. the median is not affected by the existence of an outlier. the standard deviation is affected by the existence of an outlier. the interquartile range is unaffected by the existence of an outlier.

Expresa commuter train leaves downtown sation and travels at a average speed of 55 miles per hour towards the north side sation, which is 50miles away. thirty minutes later, express commuter train #7 leaves north side and travels at a average speed of 35miles per hour towards downtown sation. at the moment the two trains pass each other, how far(in miles) is train #12 from the downtown sation and how long(in minutes) has the #12 train been traveling