SOLUTION: Following table gives study hours in a week by 100 students of class XI.Find out the arithmetic mean by step deviation method:
Hours | No. of students
<10 | 2
<20 | 6
<30
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-> SOLUTION: Following table gives study hours in a week by 100 students of class XI.Find out the arithmetic mean by step deviation method:
Hours | No. of students
<10 | 2
<20 | 6
<30
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Question 1039304: Following table gives study hours in a week by 100 students of class XI.Find out the arithmetic mean by step deviation method:
Hours | No. of students
<10 | 2
<20 | 6
<30 | 35
<40 | 62
<50 | 80
<60 | 100 Answer by robertb(5830) (Show Source):
You can put this solution on YOUR website! Let the class interval <40 be the zero basis for the step deviation.
Note that the class mark for the basis class interval is 35, and the class width is 10.
d | f | df
----------------
-3 | 2 | -6
-2 | 4 | -8
-1 | 29 | -29
0 | 27 | 0
1 | 18 | 18
2 | 20 | 40
----------------
| 100 |15
==> Mean = .
