we look at a random sample of 1000 united flights in the month of December comparing the actual arrival time to the scheduled arrive time. computer  output of the descriptive statistics for the difference in actual and expected arrival time of these 1000 flights are shown below : N=1000 Mean =4.06  St Dev. = 45.4  SE Mean =1.44  Min= -35  Q1 = -14  Median = -5  Q3 =9  Max =871  what is the sample mean difference in actual and expected arrival times?  what is the standard deviation of the difference ? x bar =      and s=    ?

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