Question

Statistics :
Find the mean of the following data.
Classes
0 - 2020 - 40
40 - 60
60 - 80 80 - 100 100 - 120
Frequency 20
35
52
44
38
31​

Answer 1

Answer:

first u need to arrange All the classes in one column. arrange all the frequency in the next column. then we must find out the mid value of the classes like eg:- if the class is 10 to 20 then we add the lower class level i.e 10 and the upper class level i.e 20 and divide the sum by 2 we will get the mid value of the class.

like the above example we must do for the rest others and arrange them in the next column.

then we must find fx i. e the frequency of the class multiplied by the mid value of the class. we will get fx. so l8ke that weust do it for the rest of them. and then we must find out sigma f that is sum of all the frequencies and also we must find out sigma fx that is sum of all the values in fx.

then we must divide sigma fx by sigma f.

then Lo you will get ur answer I. e the mean

Answer 2

Step-by-step explanation:

F. x. fx.

20. 10. 200. mean=fx/f

35. 30. 1050.

52. 50. 2600

44. 70 3080

38 90. 3420

31. 110. 3410

f=220. fx=