Required information Each of 16 students measured the circumference of a tennis ball by four different methods which were A

Question

Required information Each of 16 students measured the circumference of a tennis ball by four different methods which were A Estimate the circumference by eye B Measure the diameter with a ruler then compute the circumference C Measure the circumference with ruler and string D Measure the circumference by rolling the ball along a ruler The results in cm are given below in increasing order for each method A 18 0 180 18 0 200 220 220 225 229 24 0 24 0 25 0 25 0 25 0 25 0 26 0 26 4 B 18 8 18 9 18 9 19 8 20 1 20 4 20 4 20 4 20 4 20 5 212 217 220 220 220 23 6 C 20 2 20 5 20 5 207 208 209 210 210 21 0 21 0 210 21 4 215 215 215 21 6 D 20 0 20 0 20 0 20 0 20 2 20 5 20 5 20 6 20 7 20 7 21 0 213 215 21 6 221 22 3 Compute the 20 trimmed mean measurement for each method Method A Method B Method C cm cm cm

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