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3 years ago

15x + 4 for x = -1.5 1

Mathematics

2 answers:

german3 years ago

6 0

Answer:

-18.5

Step-by-step explanation:

15x +4

Let x = -1.5

15(-1.5) +4

-22.5 +4

-18.5

kumpel [21]3 years ago

6 0

Answer: -18.65

Step-by-step explanation: Here, we have the expression 15x + 4 and we want to evaluate the expression when x = -1.51.

To evaluate an expression, we simply plug the value of the variable into the expression and solve.

So here, since x is equal to -1.51, we have 15(-1.51) + 4.

15(-1.51) is equal to -22.65.

So we have -22.65 + 4 which is equal to -18.65.

So the value of our expression when x is equal to -1.51 is -18.65.

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Answer:

$X \sim N(\mu= 70, \sigma=15)$

From this info and using the empirical rule we know that we will have about 68% of the scores between:

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And 99.7% of the values between

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Step-by-step explanation:

For this problem we can define the random variable of interest as "the student grades" and we know that the distribution for X is given by:

$X \sim N(\mu= 70, \sigma=15)$

From this info and using the empirical rule we know that we will have about 68% of the scores between:

$\mu -\sigma = 70-15=55$

$\mu +\sigma = 70+15=85$

95 % of the scores between:

$\mu -2\sigma = 70-2*15=40$

$\mu +2\sigma = 70+2*15=100$

And 99.7% of the values between

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$\mu +3\sigma = 70+3*15=115$

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