Question

how to find xi in statistics

Answer 1

Finding xi in a data :

xi is defined as the class mark !!

To find xi perform these steps :

• Find the upper limit of the class
• Find the lower limit of the class
• Add the two limits
• Then divide the sum by two
• You will get the class mark

Examples :

Number of students         Marks

10   -     20                            97

20   -     30                           96

30   -     40                            95

40   -      50                           94

Find the xi of class 30 - 40

xi = ( 30 + 40 ) / 2

  = 70 / 2

  = 35

Find the xi of class 10 - 20

xi = ( 10 + 20 ) / 2

   = 30 / 2

   = 15

Hope you understood :-)

Hope it helps u ^___^

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Answer 2

Step-by-step explanation:

xi represents the ith value of variable X.

For the data, x1 = 21, x2 = 42, and so on. ...

For the data,

Σxi = 21 + 42 + 52 = 290.