STATISTICS [ X ]

               YASH   CLASSES

        

                      STATISTICS  [ X ]

 1. If  the arithmetic  mean  of  5,6 ,8 7 , x  and  4

      is  7 . find the value of  x .

2. If  the arithmetic  mean  of  8,0 ,8 7 , x  and  5

      is  7 . find the value of  x .

3. If  the arithmetic  mean  of  4.5 ,8.5 , 8. 7 , x  and

     3.5  is  7 . find the value of  x .

 4.The weight of 10 newly born baby 3.6 , 3.5 ,5.2

     4.2 , 4.1 , 4.4 ,  3.6 , 4.5 ,  3.6 , 4.5  find mean .

 5. The weight of 7   men   42 , 41 , 44 ,  36 ,

      45 ,  36 , 45  find mean .

 6.  speed of ten person in km/hr are 47, 53, 51 ,52 ,48,  

      87,  77 , 58 , 59 , 51 find  mean speed .

 7. If the observation of  mean z , z + 2 , z + 3, z +  5 ,

        z + 8  is  11. find  z .

 8. If the observation  of mean  x + 2 ,  2x -1 , 3x + 1

      5x- 1 , 2x +5 is 8 . find  the value of  x .

 9. If the observation  of mean  x + 2.5 , 2x  , 3x + 1.2

    3.5x- 1 , 2.8x + 5 is 9 . find  the value of  x .

 10.The  average  marks  secured  by  36 students  was

       52 . But  it was  discovers  that  an item 64 was

        misread as 46 . Find  the correct mean of marks .

11. The  average  marks  secured  by  18 students  was

       50 . But  it was  discovers  that  an item 58 was

        misread as 48 . Find  the correct mean of marks .