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4 years ago

12 is 20%of what number

Mathematics

2 answers:

grandymaker [24]4 years ago

7 0

<h2>12 is 20% of 60</h2><h2></h2><h2>Work is provided in the image attached.</h2>

ra1l [238]4 years ago

4 0

let's say is "x", thus "x" is the 100%, so, if "x" is the 100% and we know 12 is 20% of that, what's "x"?

$\bf \begin{array}{ccll} amount&\%\\ \cline{1-2} x&100\\ 12&20 \end{array}\implies \cfrac{x}{12}=\cfrac{100}{20}\implies \cfrac{x}{12}=5\implies x = 60$

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Free_Kalibri [48]

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The formula for the variance is,

$S^2=\frac{\sum (x_i - \bar{x})^2}{n-1}$

where,

$S^2$ = sample variance

$x_i$ = the value of the one observation

$\bar{x}$ = the mean value of all observations

n = the number of observations

For given question,

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So, $\bar{x}=31$

Using the formula for variance ,

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Learn more about the variance here:

brainly.com/question/13673183

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2 years ago

12 is 20%of what number​

12 is 20%of what number