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 March 27th, 2014, 05:08 AM #1 Newbie   Joined: Mar 2014 Posts: 4 Thanks: 0 Statistic Math problem In a factory of bulbs , the samples of bulbs is 100 . 700 hours has stayed on 10 bulbs , 750 hours - 17 bulbs , 850 hours - 35 bulbs , 950 hours - 28 bulbs , 1000 hours - 10 bulbs . Find the average value of hours stayed on PS . Sorry for my english.
 March 27th, 2014, 05:37 AM #2 Math Team   Joined: Sep 2007 Posts: 2,409 Thanks: 6 Re: Statistic Math problem That's a pretty standard problem, isn't it? To find the average of "n" numbers, add them all up and divide by n. Here, you are given "groups" but you should know that if the number 750 occurs 17 times then the sum of 750, 17 times, is 17(750). "700 hours has stayed on 10 bulbs , 750 hours - 17 bulbs , 850 hours - 35 bulbs , 950 hours - 28 bulbs , 1000 hours - 10 bulbs." Okay, the average is $\frac{(700)(10)+ (750)(17)+ (850)(35)+ (950)(2+ (1000)(10)}{10+ 17+ 35+ 28+10}= \frac{86100}{100}= 861" /> hours.
 March 27th, 2014, 10:30 AM #3 Newbie   Joined: Mar 2014 Posts: 4 Thanks: 0 Re: Statistic Math problem I found it , when i saw that , it was that easy i laughed at myself. But thanks, I wasn't so sure about it.

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