Find the mean of the following distribution:

From a solid cylinder whose height is 15 cm and the diameter 15 16 cm, a conical cavity of the same height and same diameter is hollowed out. Find the total surface area of remaining solid. (give your answer in terms of π)

OR

The height of a cone is 10 cm. The cone is divided into two parts using a plane parallel to its base at the middle of its height. Find the ratio of the volumes of the two parts.

Prove that the ratio of the areas of two similar triangle is equal to the ratio of the squares of their corresponding sides.

OR

Prove the length of tangents drawn from an external point to a circle are equal.

The 17^th term of an A.P. is 5 more than twice its 8^th term. If 11^th terms or A.P. is 43; then find its n^th term.

OR

How many terms of A.P. 3, 5, 7, 9, …. Must betaken to get the sum 120?

Three consecutive positive integers are such that the sum of the square of the first and the product of the other two is 46. Find the integers.