The monthly sales of cars (in L.L) in a show rooms for a company are assumed to follow a normal distribution. A sample of monthly sales has been observed, and given as (in Millions of L.L): 140 115...

Extracted text: The monthly sales of cars (in L.L) in a show rooms for a company are assumed to follow a normal distribution. A sample of monthly sales has been observed, and given as (in Millions of L.L): 140 115 138 97 104 The confidence interval for the mean sales in all salesrooms, at a 99% level is: 125 145 8 125 (87.37, 157.96) (96.63, 144.92) (92.51, 159.05) (97.19, 142.15)