A chain of video stores sells three different brands of DVD players. Of its DVD player sales, 50% are brand 1 (the least expensi
ve), 30% are brand 2, and 20% are brand 3. Each manufacturer offers a 1-year warranty on parts and labor. It is known that 25% of brand 1's DVD players require warranty repair work, whereas the corresponding percentages for brands 2 and 3 are 20% and 10%, respectively.If a customer returns to the store with a DVD player that needs warranty repair work, what is the probability that it is a brand 1 DVD player
Probability that it is a brand 1 DVD player that needs repair work = Probability of brand 1 DVD needing repairs / Probability that a DVD player will need fixing while under warranty
Probability of brand 1 DVD needing repairs = Brand 1 sales percentage * Percentage of brand 1 needed repair
= 50% * 25%
= 12.5%
Probability that a DVD player will need fixing while under warranty = (50%* 25%) + (30% * 20%) + (20% * 10%)
= 20.5%
Probability that it is a brand 1 DVD player that needs repair work = 12.5% / 20.5%
mainly because of the countries negative trade balance, but also because it is strictly regulated by the central bank which is the National bank of Ethiopia.
A. When the employees are more educated and have the higher income as compared with the less educated employees so here education would be indepedent variable and the income is dependent variable. Also the relationship between these two variables i.e. education and income is positive
