Consider results of 20 randomly chosen people who have run a marathon. Their times, in minutes, are as follows: 140, 145, 151, 162, 169, 178, 182, 193, 199, 209, 218, 220, 236, 241, 258, 259, 274, 278, 286, 295.Calculate a 90% upper confidence bound in the meantime of the race. Assume distribution to be normal.

Agas contained within a piston-cylinder assembly e end nation about same energy states, 1 and 2, where pi 10 bar, v undergoes two processes, a and b, between the sam 0.1 m3, ui-400 kj and p2 1 bar, v2 1.0 m2, u2 200 kj: process a: process from 1 to 2 during which the pressure- volume relation is pv constant process b: constant-volume process from state 1 to a pressure of 2 bar, followed by a linear pressure-volume process to +20 0 state 2 kinetic and potential energy effects can be ignored. for each of the processes a and b, (a) sketch the process on p-v coordinates, (b) evaluate the work, in kj, and (c) evaluate process the heat transfer, in kj