Q.4. two thermocouples (temperature measurement devices) are tested by inserting their probes in boil- ing water, recording the readings, removing and drying the probes, and then doing it again. the results of five measurements are as follows: t(°c)-thermocouple a | 72.4 | 73.1 | 72.6 72.8 | 73.0 t(c) thermocouple b 973 1014 98.701100.4 (a) for each set of temperature readings, calculate the sample mean, the range, and the sample (b) which thermocoupie readings exhibit the higher degree of scatter? which thermocouple is more standard deviation. accurate?

An external consultant recommends that a plant installs a bank of capacitors for power factor correction. this will reduce the peak electrical demand charges by an average of 93 kw every month. the plant current pays $13 per kw in peak demand charges. the capacitor bank will include 223 kw of fixed capacitors, and 183 of variable capacitors. the fixed capacitors cost $59 per kw, and the variable capacitors will cost $65 per kw. the consultant charges 21% of the equipment costs to install the capacitors. because this project will reduce the demand for the electric utility, they are prepared to provide a one-time rebate of $42 per kw of reduced demand. what is the simple payback period for this project (in years)?