Math, asked by shikasing33, 9 months ago

the mean of the following frequency distribution is 20 determine the value of x​

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Answers

Answered by geethakamath2014
1

I think it's the answer

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Answered by jitendra420156
4

Therefore the value of x=1.5

Step-by-step explanation:

Class               Frequency(f)       Mid class(x)     fx

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

                           ____                                      _____

                         Σf=5+12x                          Σfx=25+290x

Mean =\frac{\sum f.x}{\sum f}

         =\frac{25+290x}{5+12x}

But given that the mean of the distribution is 20

∴  \frac{25+290x}{5+12x}=20

⇒(25+290x)=20(5+12x)

⇒25+290x=100+240x

⇒290x-240x=100-25

⇒50x=75

⇒x=1.5

Therefore the value of x=1.5

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