Let X represent the full height of a certain species of tree. Assume that X has a normal probability distribution with mean 204.1 ft and standard deviation 63.7 ft. You intend to measure a random sample of n = 143 trees. The bell curve below represents the distribution of these sample means. The scale on the horizontal axis is the standard error (standard deviation) of the sampling distribution. Complete the indicated boxes, correct to two decimal places. - To get the values correct along the horizontal axis, be sure to use the exact value of the standard deviation (not the rounded value you entered in the answer box above).

Bringing all of section 6.2 together... A company knows that replacement times for the DVD players it produces are Normally distributed with a mean of 7.9 years and a standard deviation of 2.2 years. Find the proportion of a randomly selected DVD players that will have a replacement time less than 0.9 years? P(X < 0.9 years) = [3 (Enter your answer accurate to 4 decimal places.) If the company wants to provide a warranty so that only 1.5% of the DVD players will be replaced before the warranty expires, what is the time length of the warranty? warranty = [:J years (Enter your answer as a number accurate to 1 decimal place.)

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