Q3. The following data give the speeds (in km per hour) of 8 cars travelling on the street. 811 *** 850 733 715 767 780 *** **** indicates 3rd 4th 6th digits of student ID number Assuming that the speeds of all cars travelling on this highway have a normal distribution. Construct a 98% confidence interval for the mean speed of all cars travelling on the highway and make a comment on the result.

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