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FOR QUESTIONS 18 AND 19 THE LIFETIME OF A SPECIFIC BRAND OF ALKALINE BATTERY USED...

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FOR QUESTIONS 18 AND 19 THE LIFETIME OF A SPECIFIC BRAND OF ALKALINE BATTERY USED IN A SMOKE ALARM IS NORMALLY DISTRIBUTED WITH A MEAN OF 4 000 HOURS AND A STANDARD DEVIATION OF 600 HOURS 18 FIND THE PERCENTAGE OF BATTERIES THAT WILL LAST BETWEEN 4 120 AND 4 720 HOURS b a b 60 30 6 46 4 19 4 6 e 19 IF 500 000 BATTERIES ARE PRODUCED HOW MANY WILL LAST AT LEAST 4 600 HOURS c d e Son 420 500 170 500 79 500 410 000 430 000

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