Suppose that 45 workers in a textile mill are selected at randome in a study of accident rate. the number of accidents per worker is assumed to be Poisson distributed with mean . The average number of accidents per worker is .

a) Find an approximate one-sided lower 90% confidence limit for using CLT, that is, , where

b) Repeat a) using .

c)Find a conservative one-sided lower 90% confidence limit for .