.. 11 E 30. i) 1000 lightbulbs with an average life of 120 days. in streets of Mumbai distributed (i) How many will expire in less than 90 days 7 bi) 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 9 Solution Given : The data X= 120 given X- with variance If x= 120 0.0668 X = 90 Variance 400 is shown in the following diagram the value of 2: 90-120 20 0.4332 Their length of life is normally 400 days. A 90 120 Area enclosed between. 0.5 0.0668 04 332 are installed. - 30 20 Z 10=20 -1.5 4 Z Senaste B FOR EDUCATIONAL USE 1.5

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