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3 years ago

What is the answer to -11+1/3x+9=7

Mathematics

2 answers:

artcher [175]3 years ago

7 0

The answer is C that is X=27

view the picture for step by step solution

MArishka [77]3 years ago

5 0

Answer:

1/27

Step-by-step explanation:

subtract both sides by 9

-11+1/3x=-2

add 11 to both sides

$\frac{1}{3}$ x = $\frac{9}{1}$

this will bring you to 1/3 devided by 9/1

reciprocate 9/1 into 1/9

multiply out to

1/27

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3 years ago

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Answer:

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Step-by-step explanation:

Empirical rule establishes, for a normal distribution with mean μ and σ as standard deviation:

In interval μ ± σ or ( μ + σ ; μ - σ) we should find 68.27 % of all values of the population, and by simmetry 68.27/2 = 34,14 % should be over the mean and the other half would be values below the mean

Therefore in our case

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And

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a) Then 68,34 % of values will fall in this interval

We know now that value 34 is 1* σ below the mean, and is at the limit of 34,14 %

b) μ + 2*σ = 44 * 2*10 = 44 + 20 = 64

64 is the upper limit for the interval μ + 2*σ and we know that 95.45 % of all values will fall between ( μ - 2*σ ; μ + 2*σ ) and by simmetry just one side of this interval (the right side ) will have 95.45/2 = 47;73 %

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