The class marks in a frequency table are given to be 5, 10, 15, 20, 25, 30, 35, 40, 45, 50. The class limits of the first five classes are

In a test in Mathematics, 20% of the students obtained “first class”. If the data are represented by a Pie-Chart, what is the central angle corresponding to “first class”?

The following table gives the monthly expenditure of two families:

In constructing a pie diagram to the above data, the radii of the circles are to be chosen by which one of the following ratios?

How many Ramsar conservation have been enlisted from India so far? (as of 2019)

What is the number of diagonals of an octagon?

In an examination, 40% of candidates got second class. When the data are represented by a pie chart, what is the angle corresponding to second class?

A random sample of 20 people is classified in the following table according to their ages:

What is the mean age of this group of people?

Lithosphere consists of

If 3cosθ = 4sinθ, then what is the value of tan (45° + θ)?