The table given below is the calibration data for a typical pressure gauge. a. plot this calibration data and present the plot. explain which data you consider the 'known' value and why. b. if my pressure gauge reads 42 psi, what is the corresponding corrected pressure value on the downscale (while decreasing pressure)? c. explain why it is necessary to measure both increasing and decreasing pressures for the calibration curves. deadweight tester (psi) bourdon gauge (psi) 20 42 65 81 108 100 120 140 160 180 200 200 180 160 121 145 161 184 205 205 140 120 100 188 168 149 129 110 85 66 44 21