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3 years ago

What is 9+10. a)21b)19c)91d)910

Mathematics

2 answers:

horrorfan [7]3 years ago

6 0

Your answer is b, or 19 :)

timofeeve [1]3 years ago

4 0

B) 19 is answer cause 10+9=19

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3 years ago

A group of 59 randomly selected students have a mean score of 29.5 with a standard

algol [13]

Answer:

$29.5-1.671\frac{5.2}{\sqrt{59}}=28.37$

$29.5+1.671\frac{5.2}{\sqrt{59}}=30.63$

And we can conclude that the true mean for the scores are given by this interval (28.37; 30.63) at 90% of confidence

Step-by-step explanation:

Information given

$\bar X = 29.5$ represent the sample mean

$\mu$ population mean

s= 5.2 represent the sample standard deviation

n=59 represent the sample size

Confidence interval

The confidence interval for the true mean is given by the following formula:

$\bar X \pm t_{\alpha/2}\frac{s}{\sqrt{n}}$ (1)

The degrees of freedom are given by:

$df=n-1=59-1=58$

The Confidence interval is 0.90 or 90%, the significance is $\alpha=0.1$ and $\alpha/2 =0.05$ , and the critical value is $t_{\alpha/2}=1.671$

Now we have everything in order to replace into formula (1):

$29.5-1.671\frac{5.2}{\sqrt{59}}=28.37$

$29.5+1.671\frac{5.2}{\sqrt{59}}=30.63$

And we can conclude that the true mean for the scores are given by this interval (28.37; 30.63) at 90% of confidence

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3 years ago

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4 years ago

Solve for y: 10x=1000 A) y=-100 B) y=100 C) y=10 D) y=-10

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$\text {Hey! Let's Solve this Equation!}$

$\text {The Only Step is to Divide 10:}$

$\text {10y/10=1000/10}$

$\text {Your Answer would be:}$

$\fbox {y=100}$

$\text {Note: When dividing a number by 10 all you gotta do is remove a 0}$ $\text { when it comes to dividing numbers like 1000}$

$\text {Best of Luck!}$

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3 years ago

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