Question: Please help only two question very important. The mean weight of trucks traveling on a particular section of 1-475 is not known. A state highway

Please help only two question very important.

The mean weight of trucks traveling on a particular section of 1-475 is not known. A state highway inspector needs an estimate of the mean. He selects a random sample of 49 trucks passing the weighing station and finds the mean is 15.8 tons, with a standard deviation of the sample of 4.2 tons. What is probability that a truck will weigh less than 14.3 tons? * [) (10 Puan) YanitiniZI girin 6 Two accounting professors decided to compare the variance of their grading procedures. To accomplish this, they each graded the same 10 exams with the following results: At the 5% level of significance, what is the decision regarding the null hypothesis? *[ (14 Puan) Mean Grade Standard Deviation Professor 1 79.3 22.4 Professor 2 82.1 12.0

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