Please help answering these questions using Openbugs or R studio codes.

Twenty patients, 10 of normal weight and 10 severely over- weight underwent an exercise stress test, in which they had to lift a progressively increasing load for up to 12min, but they were allowed to stop earlier if they could do no more. On two occasions the equipment failed before 12min. The times (in min) achieved were: Normal weight: 4, 10, 12*, 2, 8, 12*, 3+, 6, 9, 12* Overweight: 7+, 5, 11, 6, 3, 9, 4, 1, 7, 12* *Reached end of test; lequipment failure. (I am grateful to C Osmond for these data). (a) What are the observed and expected values? (b) What is the value of the log rank test to compare these groups? (c) Playing with the data: What is the effect of changing one of the 12' to 30'? 3+ to 121'? 8 to 120