Question

(50 points) (explanation)
( IN the answer use the formula mean= ∑fx/∑f)

x= 15, 40 , 30, 10, 20
f= 20, 10, 5, 15, 30

Answer 1

x 15 40 30 10 20 f 20 10 05 15 30 fx 300 400 150 150 600 Sigma x = 15+40+30+10+20= 115 Sigma fx =300+400+150+150+600=1600 Mean = sigma fx/sigma x = 1600/115 =13.91 Here multiply f*x Then sigma means sum of the terms I don't have sigma symbol so i typed sigma word

Answer 2

HELLO FRIEND HERE IS YOUR ANSWER,,,,,,,,,

Given data to us:

x = 15, 40, 30, 10 and 20.

f = 20, 10, 5, 15 and 30.

First calculate $\bf{f \times x}$:

$\bf{15 \times 20, \: 40 \times 10, \: 30 \times 5, \: 10 \times 15 \: and \: 20 \times 30}$

$\bf{fx = 300, \: 400, \: 150, \:150, \: 600}$

Now, $\bf{\Sigma \: x = 15 + 40 + 30 + 10 + 20}$

$\bf{\therefore \: \: \Sigma \: x = 115}$

Add the following values obtained from $\bf{fx}$ by using the adding function to add up all the values using $\Sigma$.

Therefore,

$\bf{\Sigma \: fx = 300 + 400 + 150 + 150 + 600}$

$\bf{\Sigma \: fx = 1600}$

To find the mean by this given formula, just substitute the following values into this:

$\bf{Mean = \frac{\Sigma \: fx}{\Sigma \: x}}$

$\bf{Mean = \frac{1600}{115}}$

$\bf{\therefore \: \: Mean = 13.91}$

HOPE THIS HELPS YOU AND SOLVES THE DOUBTS FOR USING THE MEAN FORMULA!!!!!!!