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Use the table to answer the question. Note: Round z-scores to the nearest hundredth and then find the required A values using the table. A manufacturer of light bulbs finds that one light bulb model has a mean life span of 1030 h with a standard deviation of 89 h. What percent of these light bulbs will last as follows? (Round your answers to one decimal place.) (a) at least 980 h. 21.2 X% (b) between 810 and 880 h 3.9 %

Use the table to answer the question. Note: Round z-scores to the nearest hundredth and then find the required A values using the table. A manufacturer of light bulbs finds that one light bulb model has a mean life span of 1030 h with a standard deviation of 89 h. What percent of these light bulbs will last as follows? (Round your answers to one decimal place.) (a) at least 980 h. 21.2 X% (b) between 810 and 880 h 3.9 %

MATLAB: An Introduction with Applications
MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
Section: Chapter Questions
Problem 1P
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I need help solving a) I tried 21.2, 21.9, and they were both incorrect. Please explain step by step. 

Use the table to answer the question. Note: Round z-scores to the nearest hundredth and then find the required A values using the table. A manufacturer of light bulbs finds that one light bulb model has a mean life span of 1030 h with a standard deviation of 89 h. What percent of these light bulbs will last as follows? (Round your answers to one decimal place.) (a) at least 980 h 21.2 % (b) between 810 and 880 h 3.9 %
Transcribed Image Text:Use the table to answer the question. Note: Round z-scores to the nearest hundredth and then find the required A values using the table. A manufacturer of light bulbs finds that one light bulb model has a mean life span of 1030 h with a standard deviation of 89 h. What percent of these light bulbs will last as follows? (Round your answers to one decimal place.) (a) at least 980 h 21.2 % (b) between 810 and 880 h 3.9 %
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