Question

pls answer as early as possible​

Answer 1

Answer:

x=95/12

Step-by-step explanation:

mean = number of observation / total number of observation

mean = 5+6x+3x+x+2x/5

20 =5+12x/5

20*5 =5+12x

100-5 = 12x

95 = 12x

95/12 = x

to verify substitute the value of x

mean = 5+6*95/12+3*95/12+95/12+2*95/12 /5

mean = 100/5

mean. = 20

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Answer 2

Answer:

Value of x = 1.5 .

Step-by-step explanation:

We are given with the following frequency distribution;

    Class           Frequency (f)          X               X * f

   0 - 10                 5                         5                25

   10 - 20               $6x$                       15                $90x$

   20 - 30              $3x$                       25               $75x$

   30 - 40               $x$                        35               $35x$

   40 - 50              $2x$                      45              $90x$      

                     $\sum f=12x+5$                  $\sum Xf = 290x+25$  

Mean of data = $\frac{\sum Xf}{\sum f}$ which is given to us 20.

                20  =  $\frac{290x+25}{12x+5}$

             20*(12x + 5) = 290x + 25

             240x + 100 = 290x + 25

             290x - 240x = 100 - 25

                50x = 75

                  x = 75/50 = 1.5

Therefore, value of x is 1.5 .

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