Exams

The mean of marks secured by 30 students in division-A of class X is 67, 55 students of division-B is 63 and that of 40 students of division-C is 61. What is the mean of marks of the students of three divisions of Class X?

If tanθ = 815, then 1-sinθ1+sinθ is

In ΔPQR, S and T are points on side PQ and PR respectively. ST is parallel to QR. If S divides PQ in the ratio 4:1 and length of QR is 15 cm,what is the length of ST?

Vacuum Tubes were used by _________ Generation of Computers.

The total surface area of a hemisphere is 166.32 sq cm, find its radius?

A series is given, with one term missing. Choose the correct alternative from the given ones that will complete the series.

41, 43, 47, 53, ?

__________ refers to the number of births during a given period in the population that are added to the initial density.

What is the average of all numbers between 8 and 74 which are divisible by 7?