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2 years ago

Simplify (-8.5)X(-5)( -2).

Mathematics

2 answers:

Sedaia [141]2 years ago

8 0

Final answer: 85
explanation:
•multiply -5 by 2 = -10
•multiply -8.5 by -10= 85

m_a_m_a [10]2 years ago

4 0

Answer:

-85x (If "X" is a variable)

-85 (If "X" is a multiplication symbol)

Step-by-step explanation:

Not sure if the "X" is a variable or a multiplication symbol

Therefore either of my answers are correct.

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3 years ago

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Softa [21]

Answer:

Step-by-step explanation:

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3 years ago

Read 2 more answers

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Novay_Z [31]

Answer:

$ME=z_{\alpha/2}\frac{\sigma}{\sqrt{n}}$ (1)

$n=(\frac{z_{\alpha/2} s}{ME})^2$ (2)

The critical value for 95% of confidence interval now can be founded using the normal distribution. And in excel we can use this formla to find it:"=-NORM.INV(0.025,0,1)", and we got $z_{\alpha/2}=1.96$ , replacing into formula (2) we got:

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So the answer for this case would be n=25 rounded up to the nearest integer

Step-by-step explanation:

Previous concepts

A confidence interval is "a range of values that’s likely to include a population value with a certain degree of confidence. It is often expressed a % whereby a population means lies between an upper and lower interval".

The margin of error is the range of values below and above the sample statistic in a confidence interval.

Normal distribution, is a "probability distribution that is symmetric about the mean, showing that data near the mean are more frequent in occurrence than data far from the mean".

$\bar X$ represent the sample mean for the sample