afleveringsforberedelse

You are interested in the performance of a production process and want to study the number of defects per item. You inspect 500 randomly selected items and log the number of defects observed on each. Your results are tabulated alongside...
a. Calculate the probability of the respective numbers of defects assuming that the conditions remain unaltered.
b. Confirm that you have found a probability distribution.
c. Find the expected value E(X).
d. Find the spread of the distribution V(X) and SD(X).
e. Find the probability that a random item
1. is without defect
2. has more than 2 defects.
f. Comment on the type of experiment.
 

jeg er i tvivl om brugen af formler idet jeg er startet men tvivler nu om det er de rigtige jeg bruger.. tænkte på union rule og intersection samt joint men har så også lavet lidt i binomialfordeling..

er der nogen som kan give et godt råd..