1. The incidence of occupational disease in an industry is such that the workers have a 20% chance of suffering from it. What is the probability that out of six workers 4 or more will contract the disease?
2. Use chi-square test to test if the two attributes (Performance and Training) in the following table are independent. Test at 5% level of significance.
|
Performance
|
Training
|
|
Intensive
|
Good
|
Average
|
Total
|
|
Above Average
|
100
|
150
|
40
|
290
|
|
Average
|
100
|
100
|
100
|
300
|
|
Poor
|
50
|
80
|
150
|
280
|
|
Total 250
|
330
|
290
|
870
|