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N.B. This is for SAT Subject Test Math Level 2
A taxicab company wanted to determine the fuel cost of its fleet. A sample of 30 vehicles was selected, and the fuel cost for the last month was tabulated for each vehicle. Later it was discovered that the highest amount was mistakenly recorded with an extra zero, so it was 10 times the actual amount. When the correction was made, this was still the highest amount. Which of the following must have remained the same after the correction was made?
(E) standard deviation
Since the median is the middle value, it does not change if the number (quantity) of values above and below it remain the same.