QUESTION 7 0.5 points Save Answer Consumer Reports indicated that the average li

Question

QUESTION 7 0.5 points Save Answer Consumer Reports indicated that the average life of a refrigerator before replacement is 14 years with a variance of approximately 6.25 years. A manufacturing company (suppose that all refrigerator brands are created equal) wishes to offer a Manufacturer's Guarantee and will replace a refrigerator that breaks while under the guarantee. However, the company does not want to replace more than 1% of the refrigerators under the guarantee. How long should they make the guarantee good for (i.e. how many years)? Round your answer to the nearest whole number. QUESTION 8 0.5 points Save Answer The incubation time for Rhode Island Red chicks is normally distributed with a mean of 21 days and a standard deviation of approximately 1 day If 1,000 eggs are being incubated, how many chicks do we expect will hatch in less than 21 days? QUESTION 9 0.5 points Save Answer Protein content in maize is often very important to animal scientists. Protein content in hybrids tends to be normally distributed with a mean of 8.75% with a standard deviation of approximately 0.5%. What is the probability of measuring a maize hybrid with a protein content greater than 10967 Please round your answer to 3 decimal places. QUESTION 10 0.5 points Save Answer Find ± z such that 60% of the standard normal curve falls between these two values. Report the positive z-score to 3 decimal places. Hint: It will really help if you draw the standard normal curve.

Explanation / Answer

7) for bottom 1 percentile z score =-2.5758

therefore corresponding guarantee period =mean+z*Std deviation =14-2.5758*2.5=8 Years

8) as mean lies at halfway; threfore expected eggs hatch in 21 days =np =1000*0.5 =500

9)

10) as 60% value fall between 20 and 80th percentile ; corresponding z score =0.842

for normal distribution z score =(X-)/ here mean=       = 8.750 std deviation   == 0.5

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