This quiz works best with JavaScript enabled. Home > Ugc Net > Paper 1 > Research > Z Distrbution – Quiz 1 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Z Distrbution Quiz 1 (9 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. The mean life of a tire is 30, 000 km. The standard deviation is 2000 km. Then, 68% of all tires will have a life between ..... km and ..... km. A) 28, 000 km and 32, 000 km. B) 24, 000 km and 34, 000 km. C) 26, 000 km and 34, 000 km. D) 27, 000 km and 31, 000 km. Show Answer Correct Answer: A) 28, 000 km and 32, 000 km. 2. The shelf life of a particular dairy product is normally distributed with a mean of 12 days and a standard deviation of 3 days.About what percent of the products last 8 days or more? A) 90.88%. B) 9.12%. C) 68%. D) 34%. Show Answer Correct Answer: A) 90.88%. 3. The mean temperature in Glens Falls for the month of February is 23 degrees with a standard deviation of 4.2 degrees. What is the z-score for a temperature of 17 degrees? A) 1.43. B) -1.43. C) 1. D) 11.5. Show Answer Correct Answer: B) -1.43. 4. Find the cumulative area that corresponds to a z-score of 1.25. A) 0.12. B) 0.79. C) 0.01. D) 0.89. Show Answer Correct Answer: D) 0.89. 5. In a survey of men in the United States (ages 20-29), the mean height was 69.6 inches with a standard deviation of 3.0 inches. Find the minimum height in the top 22%. A) 69.37 in. B) 67.58 in. C) 73.12 in. D) None of above. Show Answer Correct Answer: C) 73.12 in. 6. The monthly phone bills in a city are normally distributed with a mean of 30$ and a standard deviation of 12$ . Find the x-value that correspond to z-scores of 3.17. A) $ 1.80. B) $ 68.04. C) $ 32.76. D) None of above. Show Answer Correct Answer: B) $ 68.04. 7. If heights of 3rd graders follow a normal distribution with a mean of 52 inches and a standard deviation of 2.5 inches, what is the z score of a 3rd grader who is 47 inches tall? A) 5. B) -5. C) 2. D) -2. Show Answer Correct Answer: D) -2. 8. The mean temperature in Glens Falls for the month of February is 23 degrees with a standard deviation of 4.2 degrees. Approximately what percent of days in February will have days below 21 degrees? Choose the closest answer. A) 68%. B) 50%. C) 31.7%. D) 34%. Show Answer Correct Answer: C) 31.7%. 9. Using a z-score table. Fernando is 60 inches tall. The average height for his age and gender is 68 with a standard deviation of 10 inches. What percent of his peers are shorter than him? A) 21.19%. B) 46.81%. C) 8%. D) 78.81%. Show Answer Correct Answer: A) 21.19%. Related QuizzesPaper 1 QuizzesUgc Net QuizzesReporting And Thesis Writing QuizResearch And Scientific Methods QuizResearch Concept QuizResearch Design QuizResearch Ethics QuizResearch Methodology QuizResearch Papers For Journals QuizResearch Plagiarism And Thesaurus Quiz 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books