1000 light bulbs with a mean life of 120 days are installed in a new factory...

 

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1000 light bulbs with a mean life of 120 days are installed in a new factory and their length of life is normally distributed with standard deviation of 20 days. If it is decided to replace all the bulbs together, what interval should be allowed between replacements if not more than 10% should expire before replacement? (5 Marks) Note: You are not supposed to use EXCEL or any other software to write this answer. Q 3B): calculate the average age of migrants for both the categories of gender and write your interpretation. (5 Marks) Age group 0-4 5-9 10-14 15-19 20-24 25-29 30-34 Male Female 98,34,738 91,27,975 1,09,59,506 99,58,059 1,24,25,108 1,14.51,227 1,26,83,733 1,65,18,666 1,31,97,283 3,36,58,466 1,30,45,214 3,75,22,017 1,21,34,009 3,42,86,096 35-39 1,20,60,030 3,30.54,887 40-44 1,09,00,143 2.72.61.236 45-49 97.04.026 2,34,47,716 1.78.42.986 79,40,152 61,61,754 54,01,736 50-54 55-59 60-64 65-69 70-74 75-79 36,87,082 26,62,421 13,41,572 80-85 14,61,296 1,51,92,910 1,43,47,372 1,01,41,196 70,33,728 34,93,001 42.53.695 Note: You are not supposed to use EXCEL or any other software to write this answer ********** 1000 light bulbs with a mean life of 120 days are installed in a new factory and their length of life is normally distributed with standard deviation of 20 days. If it is decided to replace all the bulbs together, what interval should be allowed between replacements if not more than 10% should expire before replacement? (5 Marks) Note: You are not supposed to use EXCEL or any other software to write this answer. Q 3B): calculate the average age of migrants for both the categories of gender and write your interpretation. (5 Marks) Age group 0-4 5-9 10-14 15-19 20-24 25-29 30-34 Male Female 98,34,738 91,27,975 1,09,59,506 99,58,059 1,24,25,108 1,14.51,227 1,26,83,733 1,65,18,666 1,31,97,283 3,36,58,466 1,30,45,214 3,75,22,017 1,21,34,009 3,42,86,096 35-39 1,20,60,030 3,30.54,887 40-44 1,09,00,143 2.72.61.236 45-49 97.04.026 2,34,47,716 1.78.42.986 79,40,152 61,61,754 54,01,736 50-54 55-59 60-64 65-69 70-74 75-79 36,87,082 26,62,421 13,41,572 80-85 14,61,296 1,51,92,910 1,43,47,372 1,01,41,196 70,33,728 34,93,001 42.53.695 Note: You are not supposed to use EXCEL or any other software to write this answer **********

Answer rating: 100% (QA)

Solution To determine the interval allowed between replacements we need to find the lifespan thresho... View the full answer