Directions-Study the following diagram and answer the four questions.

The range of marks obtained by maximum no. of students is

If the curved surface area of a cylinder is 126π cm² and its height is 14 cm, what is the volume of the cylinder?

Let N be the greatest number that will divide 1305, 4665 and 6905, leaving the same remainder in each case. Then sum of the digits in N is:

A, B and C complete a work in 10, 12 and 15 days respectively. They started the work together. But A left the work before 5 days of its completion. B also left the work 2 days after A left. In how many days will the work completed? 

A train after travelling 150 Km. meets with an accident and then proceeds with 3/5 of its former speed and arrives at its destination 8 hours late. Had the accident occurred 360 Km. farther, it would have reached the destination 4 hours late. What is the total distance travelled by the train?

In the given figure, the ratio of the area of the largest square to that of the smallest square is:

Area of a circle inscribed in a square is 308 cm².The length of the diagonal of the square is

Find the standard deviation of the following data (rounded off to two decimal places). 

5, 3, 4, 7