What is 1/4 x 3 6 / 4

1 answer:

3 0

$\frac{1}{4} * 3 \frac{6}{4}$

Convert mixed numbers to improper fractions:

$= \frac{1}{4} * \frac{18}{4}$

Multiply fractions:

$= \frac{18}{4*4}$

$= \frac{18}{16}$

Cancel the common factor 2 :

$\frac{18/2}{16/2}$

$= \frac{9}{8}$

hope this helps!

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CV smokers: 0.387

CV non-smokers: 0.234

Step-by-step explanation:

We will calculate the relative dispersion of each data set with its coefficient of variation (ratio of the standard deviation to the arithmetic mean).

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Standard deviation: 286.5

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The mean and standard deviation for the non-smokers is:

Mean: 30.3

Standard deviation: 50.9

$M_n=\dfrac{1}{n}\sum_{i=1}^n\,x_i\\\\\\M_n=\dfrac{1}{15}(28.6+25.1+26.4+34.9+28.8+. . .+13.9)\\\\\\M_n=\dfrac{453.8}{15}\\\\\\M_n=30.3\\\\\\s_n=\dfrac{1}{n-1}\sum_{i=1}^n\,(x_i-M_n)^2\\\\\\s_n=\dfrac{1}{14}((28.6-30.3)^2+. . . +(13.9-30.3)^2)\\\\\\s_n=\dfrac{713.3}{14}\\\\\\s_n=50.9\\\\\\$