4. The work done by the system in an isothermal expansion from volume V, to V, can be expressed as where n is the number of moles of a gas,

R = 8.314is the universal gas constant, and T is the absolute temperature. In an experiment on 5 moles of gas, the following observations are made. If the probability that the isothermal work done exceeds 24 kW is 5%, find the mean temperature T in Kelvin. Assume sr = 0.015T.