Question 47502
The probability that a trainee will retain with the company is 0.8. The probability that an employee earns more than Rs. 20,000 per year is 0.004. The probability that an employee who was a trainee and remained with company or who earns more than Rs. 20,000 per year is 0.9
Prob(r)=0.8
Prob(>20K)=0.004
Prob(r or >20K) = 0.9
This is contradictory because
Prob (r OR >20K)=prob(r)+prob(>20K)-P(r AND >20K)
Then 0.9 = 0.8+0.004-P(r and >20K)
And P(r and >20K)=-0.096
But no Probability can be negative.
Are you sure you posted the 0.004 correctly?
Cheers,
Stan H.