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2 years ago

If the average (arithmetic mean ) of 2,7, and x is 12, what is the value of x?

Mathematics

2 answers:

masya89 [10]2 years ago

7 0

Answer:

x=27

Step-by-step explanation:

The mean is add all the numbers and divide by the number of points

(2+7+x)/3 =12

Multiply each side by 3

(2+7+x)/3 *3 =12*3

2+7+x = 36

Combine like terms

9+x = 36

Subtract 9 from each side

9+x-9 = 36-9

x = 27

nirvana33 [79]2 years ago

6 0

Answer:

X=27

Step-by-step explanation:

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In a random sample of 90 students in first grade, the mean hours of sleep per night was 9.2 with a standard deviation of 0.37 in

ss7ja [257]

Answer:

Option C is right

Step-by-step explanation:

Given are two samples

I group has sample size 90, mean = 9.2 and std dev =0,.37

II group has sample size 70, mean = 7.3 and std dev = 0.58

we find that mean difference i.e. difference between mean hours of sleep between two groups

= 9.2-7.3 = 1.9

Std error for difference = 0.0620

Since sample size is sufficiently large we can use Z critical for 99%

i.e. 2.58

Margin of error =±2.58(0.062)

=0.16

Hence confidence interval 99% for difference in hours of sleep

= (1.9-0.16,1.9+0.16)

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2 years ago

Find f(x) and g(x) so that the function can be described as y = f(g(x)). y = nine divided by square root of quantity five x plus

katrin [286]

$y=\frac{9}{\sqrt{5x+5}}$
hmm, seems that we can say that the square root thing is the g(x)

I would say
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we could also have
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or
$f(x)=\frac{9}{\sqrt{x+5}}$ and
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there are many posibilities

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