Oil field pipes are internally coated in order to prevent corrosion. Researchers investigated the influence that coating may have on the surface roughness of oil field pipes. A scanning probe instrument was used to measure the surface roughness of each in a sample of 20 sections of coated interior pipe. The data in micrometers are below:
1.92
1.12
1.68
2.64
2.78
2.29
2.26
1.57
2.64
2.65
1.45
1.51
2.11
1.61
1.23
2.49
1.21
2.41
2.82
1.24
a. Find and interpret the mean of the sample:
b. Find and interpret the median of the sample: