Provide answers to all the questions below with explanations.

1 A certain life office carried out a mortality investigation in respect of its whole life policies in the period 1 May 1996 to 1 January 2000. Part of the data is as follows: Policy No. Date of Date of Date of exit Mode of exit birth issue of policy (or censoring) (if applicable) 1.2.70 1.3.91 1.1.00 still in force 1.2.70 1.3.98 1.1.00 still in force 1.2.70 1.8.94 1.9.99 death 1.3.70 1.6.78 1.9.00 still in force 1.4.70 1.10.95 1.3.97 withdrawal 1.6.70 1.4.97 1.1.00 still in force 1.7.70 1.8.92 1.2.98 withdrawal 1.8.70 1.12.93 1.1.00 still in force Calculate Ec for a = 25, 26. ... .29.The likelihood function for the parameter @ based on a random sample of n observations from a population with a continuous uniform distribution on the range (-0/2, 0/2) is: A x; if max x.