Suppose that the miles-per-gallon (mpg) rating of passenger cars is a normally d
ID: 3050713 • Letter: S
Question
Suppose that the miles-per-gallon (mpg) rating of passenger cars is a normally distributed random variable with a mean and a standard deviation of 31.9 and 3.4 mpg, respectively. Use Table 1. a. What is the probability that a randomly selected passenger car gets more than 34 mpg? (Round “z” value to 2 decimal places, and final answer to 4 decimal places.) Probability b. What is the probability that the average mpg of two randomly selected passenger cars is more than 34 mpg? (Round “z” value to 2 decimal places, and final answer to 4 decimal places.) Probability c. If two passenger cars are randomly selected, what is the probability that all of the passenger cars get more than 34 mpg? (Round “z” value to 2 decimal places, and final answer to 4 decimal places.) Probability
Explanation / Answer
a)
b)
c)
probability =(0.2676)2 =0.0716
for normal distribution z score =(X-)/ here mean= = 31.900 std deviation == 3.4Related Questions
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