SOLUTION: The mean weight of trucks traveling on a particular highway road is not known. A highway inspector needs an estimate of the mean. He selects a random sample of 49 trucks passing th
Algebra ->
Probability-and-statistics
-> SOLUTION: The mean weight of trucks traveling on a particular highway road is not known. A highway inspector needs an estimate of the mean. He selects a random sample of 49 trucks passing th
Log On
Question 1176102: The mean weight of trucks traveling on a particular highway road is not known. A highway inspector needs an estimate of the mean. He selects a random sample of 49 trucks passing the weighting station and found the mean to be 14.9 tons, with a standard deviation of 4.1 tons. What is the probability that the average weight will be at most 13.4 tons? Answer by Boreal(15235) (Show Source):
You can put this solution on YOUR website! this is a t=(xbar-mean)/s/sqrt(n)
t is df=48
=(13.4-14.9)*sqrt(49)/4.1
=-2.56
probability t is < -2.56 given the df=48
This is 0.0068
