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https/ www.rnathd.com/Student Player Homework aspx?homeworkId=4431 4604 1 & questionId-98 flushed ecure false&cId-4648325;¢ r n MAT 119- Finite Mathematics, Fall 2017 Homework: M3HW8: Section 9.3 Save Score: 0 of 1 pt 9 of 15 (13 complete) HW Score: 80%, 12 of 15 pts Question Help * The number of light bulbs that can be expected to last less than 1470 hr is Bus Econ 9.3.23 Suppose that the life expectancy of a certain brand of nondefective light bulbs is normally distributed, with a mean life of 1200 hr and a standard deviation of 150 hr Ir 90,000 of these bulbs are produced, how many can be expected to last less than 1470 hr? Use the following links to view the Standard Normal Distribution table Click here to view page 1 of the table Click here to view page 2 of the table inter your answer in the answer box and then click Check Answer Clear All ll parts showingExplanation / Answer
P(x < 1470)
= P((x - mean)/SD) < (1470 - mean)/SD)
= P(Z < (1470 - 1200)/150)
= P(Z < 1.8)
= 0.9641
Expected no of bulbs = 0.9641 * 90000 = 86769
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