anonymous
  • anonymous
A sample of 168 individuals is selected, and the individuals are classified according to their smoking habits and the smoking habits of their parents. The results are given in the contigency table below. What is the relative frequency of individuals in the sample who have two parents who do not smoke?
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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chestercat
  • chestercat
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anonymous
  • anonymous
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kropot72
  • kropot72
First you need to find the totals of the values in the 2 rows and the 3 columns of the contingency table. Then you divide the total number of individuals who have parents neither of which smoke by 168.
anonymous
  • anonymous
well I did 168 divided by 18 and got 9.33333 because that is the only family who doesnt smoke

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anonymous
  • anonymous
I mean 47 my bad hold on
anonymous
  • anonymous
I got 3.57
anonymous
  • anonymous
ok sratch that I got 2.5 because I added 47 and 23
kropot72
  • kropot72
When I added the number of individuals who smoke, but have both parents non-smokers (23 individuals) to the number of individuals who don't smoke and who have both parents non-smokers (47 individuals) I get the following: 23 + 47 = 70 The relative frequency of individuals in the sample who have two parents who do not smoke is then given by: \[\large \frac{70}{168}= this\ fraction\ needs\ simplifying\]
anonymous
  • anonymous
yeah and I got 5/12
kropot72
  • kropot72
Correct!
anonymous
  • anonymous
wait! @kropot72 there is no option to simply, I need to round my answers to a decimal.
Vocaloid
  • Vocaloid
all you need to do is put 5/12 into a calculator, and it'll give you 5/12 in decimal form
kropot72
  • kropot72
What he said. ^^^^^
kropot72
  • kropot72
@atlantaslast How many decimal places are required in the answer?
anonymous
  • anonymous
two decimals places.
kropot72
  • kropot72
Then you will need to round up in this case.
anonymous
  • anonymous
how would that be? I just guessed and put 4.1 because it said 0.4166666
anonymous
  • anonymous
but it might be 1.6
kropot72
  • kropot72
Not really. ).416666666 rounded to two decimal places is 0.42.
anonymous
  • anonymous
so the answer would be 0.42?
kropot72
  • kropot72
Correct.
anonymous
  • anonymous
Thanks :)
kropot72
  • kropot72
you're welcome :)

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