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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 + (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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