Math, asked by vanshika1912, 1 year ago

find p if the mean of given data is 15.45

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Answers

Answered by tanyagarg14806
64

Answer:


Step-by-step explanation:

Here is the answer hope it helps... Thankyou❤❤

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Answered by Syamkumarr
35

Answer:

The value of P = 10

Step-by-step explanation:

Given data    

class               0-6       6-12      12-18      18-24      24-30  

frequency         6           8          p             9               7    

mean of the above data  = 15.45

the formula for mean  =   ∑f_{i} x_{i} /  ∑ f_{i}    

here the values of  ∑f_{i} x_{i} and ∑x_{i}  will calculate in the following table

class       frequency (f_{i})        class mark (x_{i})         f_{i} x_{i}          

  0-6                6                       0+6/2 = 3              18

  6-12               8                                    9               72

 12-18               p                                   15              15p

 18-24              9                                   21              189

 24- 30             7                                  27              189

f_{ i} =   6 +8 +p+ 9+ 7 = 30+p  

f_{i} x_{i} = 18+ 72+ 15p+ 189+ 189 = 468+15p

         mean =    \frac{468+15p}{30+p}

from given data mean =15.45

     ⇒   \frac{468+15p}{30+p} = 15.45

     ⇒ 468 +15p = 15.45(30+p)

     ⇒  468 +15p = 463.5+ 15.45p

     ⇒  15.45p-15p = 468 - 463.5

     ⇒  0.45p = 4.5  

    ⇒   p = 4.5 /0.45  

    ⇒  p =10

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