Finding collected count when given average value.

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Hellreignz
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Good morning everyone, I would really be pleased with a quick answer because I am very soon going to school. I have been asked to plot a graph, for that I am given a table with time in minutes from 0 to 6 on the first row. On the second row I was given activity in counts per minute with values 495,395,320,258,220,180,140 (they are ranged in columns below corresponding time). Then the third row is a blank row asking me collected count (in counts per minute) and I just don't know how to get it. I have been given average value of the background count which is 30 counts per minute. There is also a question asking to a certain that average value of background count is 30. I just don't know what to do please help me. :nb)
 
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And please why is half-life meaningless to background count?
 
I think that by "collected" they mean all the counts up to that time.
If you had 495 counts in the first minute and 395 in the second, you had 495+395 after the first 2 minutes.

I don't understand what are you saying in the last three sentences.