1) Length of time to complete door assembly on the automobile factory assembly line is normally distributed with mean 6.7 minutes and standard deviation 2.2 minutes. For door selected at random, determine the probability assembly line time will be between 5 and 10 minutes?
2)Manufacturer of new compact car claims he miles per gallon (mpg) for gasoline consumption is mound shaped and symmetric with mean of 25.9 mpg and standard deviation of 9.5 mpg. If 30 such cars are tested, determinethe probability the average mpg achieved by these 30 cars will be greater than 28?
Annual returns, in percentages, on stocks A and B for 3 possible states of economy are given in the table below.
|
Economy State
|
Probability
|
StockA
|
StockB
|
|
Good
|
0.5
|
40
|
20
|
|
Average
|
0.3
|
20
|
40
|
|
Bad
|
0.2
|
10
|
8
|
3) If one invested in Stock A, what would be expected annual percentage return
4) If one invested in Stock A, Determine standard deviation of percentage return?