6. (20 points) Estimate the reference evapotranspiration in mm/day using the FAO Penman-Monteith Equation for a location where the net radiation was 20 MJ/m2/day, the mean temperature was 28°C, the

dew point was 21°C, and the mean wind speed at a height of 10 m was 1.5 m/s. FAO suggests using the following formula to estimate the wind speed at 2 m based on measurement at a different height z(m):