1. Zisien measures the speeds, $x$ miles per hour, of a number of cars passing her house one day.  She knows that the speed limit is 30 miles per hour so she decides to use the coding  $y$ = $x$ – 30  when she records the data. 

She finds that  $\sum(x-30)=13.4and\sum{(x-30)}^{2}=1470.$

Is it more likely that more of the cars in Zisien’s sample were going over or under the speed limit that day? Give a reason for your answer.