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#16.C. 156 because (155+165+138+172+127+193+142)/7=156.
#17. The absolute average of the above data is 11.125 because distance from 33 to 25 is 8, from 25 to 42 is 17, from 42 to 25 again is 17, to 25 to 31 is 6, from 31 to 37 is 6, from 37 to 46 is 9, from 46 to 29 is 17 from 29 to 38 is 9 add all and divide by 8 to get the result.