[" 2) For the frequency distribution of marks scored by a student,"A=57,Sigma f_(i)=80" and "sum f_(i)d_(i)=240." Find the "],[" mean marks."]

For the frequency distribution of marks scored by student, A=57,sumf_(i)=80andsumf_(i)d_(i)=240 . Find mean marks.

Mean of a frequency distribution (bar(x)) " is " 45 . If Sigma f_(i) = 20 " find " Sigma f_(i) x_(i)

The following table shows frequency distribution of marks secured by 100 students in a particular examination. Find the mean of the marks.

For a certain frequency distribution, the value of Assumed mean (A)=1300 , sumf_(i)d_(i)=900 and sumf_(i)=100 . Find the value of mean (barX) .

For a certain frequency distribution, the value of Assumed mean (A)=1300 , sumf_(i)d_(i)=900 and sumf_(i)=100 . Find the value of mean (barX) .

If for some x in R , the frequency distribution of the marks obtained by 20 students in a test is: Then the mean of the marks is:

If for some x in R , the frequency distribution of the marks obtained by 20 students in a test is: Then the mean of the marks is:

There are 60 students in a class. The followng is the frequency distribution of marks obtained by the students in a test. where x is positive integer. Determine the mean of the marks.