Sequences and Series
For a positive integer n, let a(n)=1+21+31+41+.........+(2n−1)1 Then
A student scored marks 46 % in English, 67 % in Maths, 53 % in Hindi, 72 % in History and 58 % in Economics. As compared to other subject weightage given to Mathematics, then find weightage mean marks of students.
Find the arithmetic mean
If 69.5 is the mean of 72,70,x,62,50,71,90,64,58 and 82. Find the value of x.