A person has undertaken a construction job. The probabilities are `0.65` that there will be strike, `0.80` that the construction job will be completed on time if there is no strike, and `0.32` that the construction job will be completed on time if there is a strike. Determine the probability that the construction job will be completed on time.

A person has undertaken a business. The probabilities are 0.80 that there will be a crisis, 0.85 that the business will be completed on time if there is no crisis and 0.35 that the business will be completed on time if there is a crisis. Determine the probability that the business will be complete on time

A 1st order reaction takes 69.3 minutes for 50 %completion. Derive an equation for determining the time needed for 80 % completion of this reaction.

Rate of a reaction is the change in concentration of any one of the reactants or any one of the products in unit time. Calculate the time required for the completion of 90% of a first order reaction( k=0.2303s^(-1) )

A manufacturer has three machine operators A,B and C. The first operator A produces 1% defective items,whereas the other two operator B and C produce 5% and 7% defective items respectively. A is on the job for 50% of the time,B is on the job 30 % of the time and C is on the job for 20% of the time. A defective item is produced,what is the probability that it was produced by A?