The time between the calls at a telephone switch is an exponential rv t with an expected value of e[t]=0.02. given that t > 0.03 a. what is e[t |t> 0.03 ], the conditional expected value of t ? b. what is variance var[t |t> 0.03] and the conditional variance of t ?

To design a steam turbine to produce 12,000 hp power. a engineer comsiders using a steady state stean low st 1160fr and engineer considers using a steady state steam flow at 1160°r and 450 psia to drive this steam turbine. the exhaust of the steam is cooled by the lake (vacuum). heat losing to the surroundings is measured at a rate of 555.55 btu/s. (a) sketch the system with the given conditions. (b) neglecting kinetic and potential energy changes from inlet to exit, determine the volumetric flow rate of the steam at the inlet, (ft'/hr). must clearly show unit conversions at crtical terms.