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mario62 [17]
2 years ago
14

I think it’s b or d but which one would be more correct?

Mathematics
1 answer:
ipn [44]2 years ago
6 0

Answer:

A.) b- 9.5 = 26.5

Step-by-step explanation:

because the equation is basically saying that (the og length) - 9.5( the one he cut out) = 26.5 ( which is the remaining wood)

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a) In the interval  (  55,9  ;   456,7 ) we will find 99,7 % of all values

b) In the interval  (  122,7  ;  389,9 ) we find 95,4 % of all values

Step-by-step explanation:

For a Normal distribution N (μ ; σ ) the Empirical rule establishes that the intervals:

( μ  ±  σ  )          contains 68,3 % of all values

( μ  ±  2σ  )        contains 95,4 % of all values

( μ  ±  3σ  )        contains 99,7 % of all values

If   N ( 256,3 ; 66,8 )

σ  =  66,8        ⇒   3*σ  = 3 * 66,8  = 200,4

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And        256,3 + 200,4 = 456,7

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b) 2*σ  = 2 * 66,8  = 133,6

Then  256,3 - 133,6  = 122,7

And    256,3 + 133,6 = 389,90

Then in the interval  (  122,7  ;  389,9 ) we find 95,4 % of all values

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