Kayleyroofidn
Answered

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Please help! I’ll give brainliest also! Thank you!

Please Help Ill Give Brainliest Also Thank You class=

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Sqdancefanidn

9514 1404 393

Answer:

  The principal was right. The numbers don't add up.

Step-by-step explanation:

Based on the categorization, the total number of students polled is ...

  290 +300 +270 -80 -70 -60 -2(50) = 550

The number reportedly polled is 500, so the numbers given are inconsistent.

____

Here's how we understand the categorization.

  N(laptop) = N(all three) +N(laptop & tablet) +N(laptop & desktop) +N(laptop only)

  N(tablet) = N(all three) +N(laptop & tablet) +N(desktop & tablet) +N(tablet only)

  N(desktop) = N(all three) +N(laptop & desktop) +N(desktop & tablet) +N(desktop only)

Then the sum N(laptop) +N(tablet) +N(desktop) is ...

  N(L) +N(T) +N(D) = 3N(ltd) +2N(lt) +2N(ld) +2N(td) +N(l) +N(t) +N(d)

where N(L) = number owning a laptop, and N(l) = number owning a laptop only.

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