Homework: Week 11 Chapter 5 0 Part 1 of 3 Question 24 Score: 0 of 1 point Save The monthly utility bills in a city are normally distributed, with a mean of $100 and a standard deviation of $15. Find the probability that a randomly selected utility bill is (a) less than $67, (b) between $81 and $90, and (c) more than $120. (a) The probability that a randomly selected utility bill is less than $67 is. (Round to four decimal places as needed.) Enter your answer in the answer box and then click Check Answer. Help Me Solve This View an Example Get More Help - Clear All Check AnswerHomework: Week 11 Chapter 5 0 Part 1 of 2 Question 30 Score: 0 of 1 point Save The pregnancy length in days for a population of new mothers can be approximated by a normal distribution with a mean of 267 days and a standard deviation of 9 days. (a) What is the minimum pregnancy length that can be in the top 12% of pregnancy lengths? (b) What is the maximum pregnancy length that can be in the bottom 4% of pregnancy lengths? (a) The minimum pregnancy length is | days. (Round to one decimal place as needed.) Enter your answer in the answer box and then click Check Answer. Help Me Solve This View an Example Get More Help - Clear All Check AnswerHomework: Week 11 Chapter 5 Question 31 > Score: 0 of 1 point Save A mechanic sells a brand of automobile tire that has a life expectancy that is normally distributed, with a mean life of 31,000 miles and a standard deviation of 2400 miles. He wants to give a guarantee for free replacement of tires that don't wear well. How should he word his guarantee if he is willing to replace approximately 10% of the tires? Click to view page 1 of the table. Click to view page 2 of the table. Tires that wear out by miles will be replaced free of charge. (Round to the nearest mile as needed.) Enter your answer in the answer box and then click Check Answer. Help Me Solve This View an Example Get More Help - Clear All Check AnswerHomework: Week 11 Chapter 5 0 Question 8 Score: 0 of 1 point Save Find the area of the indicated region under the standard normal curve. Click here to view page 1 of the standard normal table. Click here to view page 2 of the standard normal table. -1.6 0 0.9 The area between z = - 1.6 and z = 0.9 under the standard normal curve is. (Round to four decimal places as needed.) Enter your answer in the answer box and then click Check Answer. Help Me Solve This View an Example Get More Help - Clear All Check
