Question

Question 15 The Environmental Protection agency requires that the exhaust of each model Typen of motor vehicle be tested for the level of several pollutants. The level of oxides - Part 1: 5 points of nitrogen (NOX) in the exhaust of one light truck model was found to vary aby Part 2: 5 points among individually trucks according to a Normal distribution with mean 1.45 10 points grams per mile driven and standard deviation 0.40 grams per mile. (a) What is the oth percentile for NOX exhaust, rounded to four decimal places? (b) Find the interquartile range for the distribution of NOX levels in the exhaust of trucks rounded to four decimal places.

Answer 1

Here we are given that - XN (1.45 0.40) o PCX (W) = 0.10 Prvi-1.45 CK-145 ) -0.10 0.400.40 PC ZC2) =0.10 20.10- 2-1.45 0.40 =-1.28 14-0.9374 - PCUCK)= 0. 25 P(u-1.45 2n-1.45 ___ 40 पर -0.25 P CZ22) = 0.25 = . -1.45 -0.40 -0.65 (1 = 1.1802 deep Cucu) = 0.75 Pcu-1:45 Lu-1.45 = 0.15 0.40 0.40 P CZCZ) = 0.75 = U-lur = 0.67 o yo fua 1.7198] EQ R = Q -Q, 10.5396