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
Algebra.Com
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 = .
RELATED QUESTIONS
the number of hours a week students devotes to study is normally distributed,with a mean... (answered by reviewermath,stanbon)
What propotion of A students studying statistics ?
The amount of time devoted to... (answered by rothauserc)
Using the date in the Excel file MBA Student Survey, find 95% confidence intervals for... (answered by solver91311)
GRAPHICAL ANALYSIS OF DATA
1. The list below shows the ages of the first 20 fans to... (answered by ikleyn)
Updated questions with added information:
A specific study found that the average... (answered by ikleyn)
The average monthly sales of 5000 firms are normally distributed with mean Rs. 36,000 and (answered by Fombitz)
In a study of the time college freshmen use to study each week, it is found that the... (answered by ewatrrr)
A class survey in a large class for first-year college students asked, "About how many... (answered by Boreal)
1. A group of 463 first-year college students were asked, “About how many hours do you... (answered by Boreal)