SOLUTION: The average age of cars driven in one town is 5.5 years with a standard deviation of 1.4 years if 25 cars are chosen from this town what is the probability that the average age of

Question 875398: The average age of cars driven in one town is 5.5 years with a standard deviation of 1.4 years if 25 cars are chosen from this town what is the probability that the average age of the cars in the sample is less than 5 years?
Answer by ewatrrr(24785) (Show Source): You can put this solution on YOUR website!

 

Hi

z =  = -1.7857

P(x < 5) = P(z <-1.7857) = .0371  0r 3.71%

Below:  z = 0, z = � 1, z= �2 , z= �3 are plotted.  

Note: z = 0 (x value: the mean) 50% of the area under the curve is to the left and %50 to the right



 

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