@Manish, you can try that question like this ( Actually i solve these type of questions like this only ) =>
T1 (Expected) = T1 (Given) + T0 (Expected) = 0.5 * 8 + 0.5 * 10 = 9
T2 (Expected) = T2 (Given) + T1 (Expected) = 0.5 * 7 + 0.5 * 9 = 8
T3 (Expected) = T3 (Given) + T2 (Expected) = 0.5 * 4 + 0.5 * 8 = 6
T4 (Expected) = T4 (Given) + T3 (Expected) = 0.5 * 16 + 0.5 * 6 = 11
PS : It would be better if u post questions in Q/A section , not in the comments .