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Snezhnost [94]
2 years ago
6

Find the value of x and y if: (x-yi)+ 7-2i =9-i​

Mathematics
1 answer:
Kruka [31]2 years ago
7 0

Answer:

x=2, y=-1

Step-by-step explanation:

(x+7)+(-y-2)i=9-i

the (x+7) part corresponds to the 9 and the (-y-2) corresponds to the coefficien of i.

x+7=9

x=2

-y-2=-1

y=-1

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0.675

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If f(x)=2+8, what is f(-1.8)? <br><br> A. 4<br> B. 6<br> C. 10<br> D. 12
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The blood platelet counts of a group of women have a​ bell-shaped distribution with a mean of 256.3 and a standard deviation of
AnnyKZ [126]

Answer:

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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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

4 0
2 years ago
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