Assume that for a five year old automobile, the probability the engine will need repair in year 6 is 0.3, while the probability that the tires need replacing in year 6 is 0.8. The probability that both the engine will require repair and the tires will need replacing in 6 is 0.2. Determine the probability that either the engine needs repair or the tires need replacing?
a) 0.24
b) 1.10
c) 0.90
d) 0.86