(a) We repeated the measurements of the length of an object five times by using a caliper with the minimum division of 0.05 mm. The results are shown below in mm units. Calculate the average and error, and record the final result with error.
No. 1; 41.53, No. 2; 41.49, No. 3; 41.48,
No. 4; 41.51, No. 5; 41.47
(b) We continued the same measurements 15 times more, and obtained the results below. By using all of the data (20 data points in total including those in (a)), calculate the average and the error. Write down the final result with error.
No. 6; 41.50, No. 7; 41.49, No. 8; 41.49, No. 9; 41.52,
No. 10; 41.51, No. 11; 41.51, No. 12; 41.50, No. 13; 41.51,
No. 14; 41.50, No. 15; 41.49 No. 16; 41.51, No. 17; 41.48,
No. 18; 41.49, No. 19, 41.51, No. 20; 41.50