4. After years of working at a weighing station for trucks, Jeff Simpson feels that the weight per truck (in thousands of pounds) follows a normal distribution with 71 and 0 = 15. In order to test this assumption, Jeff collected the following data one Monday, recording the weight of = each truck that entered his station. 85 60 81 89 90 60 50 95 60 63 50 98 76 97 67 57 86 56 75 66 89 57 82 63 54 Using 10% significance level test the hypothesis. 63 61 55 77 93 52 95 61 50 70 65 78 81 62 80 77 66 61 79 67 64 92 53 69 73 4. Afte truc] to te