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ozzi
4 years ago
13

If a variable has a distribution that is​ bell-shaped with mean 19 and standard deviation 7​, then according to the Empirical​ R

ule, 68.0​% of the data will lie between which​ values?
Mathematics
1 answer:
melamori03 [73]4 years ago
7 0
The empirical rule says that approximately 68% of a normal distribution falls within one standard deviation of the mean. In this case, this would include all values of the variable in the interval (19-7,19+7)=(12,26).
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Hope it helps!
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3 years ago
Is -(3x + 5)^2 a perfect trinomial? Why or why not?
attashe74 [19]

The given equation-(3x + 5)^2 is not a perfect trinomial because it is not obtained through the multiplication of a binomial.

<h3>What is a perfect trinomial?</h3>

A perfect square trinomial is takes the algebraic expression form ax^2 +bx + c, where the square root of the first term and the third term is the equation to the second term.

Given that:

-(3x + 5)^2

Open brackets

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Multiply through by (-)

= -9x^2 - 30x - 55

Therefore, we can conclude that the given equation-(3x + 5)^2 is not a perfect trinomial because it is not obtained through the multiplication of a binomial. i.e. the multiplication of the square root of the first and the third term did not result in the 2nd term.

Learn more about perfect square trinomials here:

brainly.com/question/88561

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2 years ago
Using the spinner above, what is the probability that you land on red or blue?
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