Dover Motors is a car dealership that sells new and used cars. Suppose they sold 140 used cars during the first quarter of 2011. The average selling price was $10,325 with a standard deviation of $2,880. A random sample of 60 used cars from this population was selected. What is the probability that the sample mean exceeds $10,000?

The probability that the sample mean exceeds $10,000 is 0.8078.

Step-by-step explanation:

The objective of the problem is obtained below:

From the given information, let X denotes the number of used cars which follows normal distribution with mean 10,325 and the standard deviation of 2,880 and sample size is 60 used cars. That is, u=10,325,δ = 2,880 and n=60

are used to estimate the probability that the sample mean exceeds 10,000.

See attached pictures.

0.02040816326

d. it is a convex pentagon because it has five sides and none of the sides would extend into the inside of the polygon.

step-by-step explanation: