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In my random sample I found 15 worms and 6 lady bugs in my pile of dirt.in my backyard I have a total of 1,200 worms.what do I know about the sample?What do I know about the population?how many total ladybugs are in my backyard ?

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You know you have a 15/1200 sample.
You know you have 1200 worms as the population.
Assuming an even distribution 15/1200 = 6/l solving for l gives 1200*6/15 ladybugs. (480). Why didn't you count the ladybugs when you counted the total worms - then you'd know for sure the total ladybugs in your back yard. (Personally, I doubt you'd find an even distribution.)

Posted on Nov 07, 2014

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Oh geeze,, you have 480 ladybugs in all?!!!
That makes a total combined population of 1,680 critters!
And why did you only take a 1.25% sample?!!

But maybe ladybugs like living in dirt piles better than other backyard areas, so you might not have that many! ;)

Posted on Nov 07, 2014

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