An unbiased coin is tossed until a head appears. The expected number of tosses required is
Let X denote the number of tails tossed before the head appears. Then X is a geometric random variable. P(head) = 1 / 2 and the expectation is E(X)=1 / (1/2) = 2.
Three circle of diameter 14 cm each, are bound together by a rubber band, as shown in the figure. The length of the rubber band, in cm, if it is stretch...
If the curved surface area and the radius of a cylinder are 440 cm2 and 10 cm, respectively, then find the volume (in cm3) of the ...
A circle is inscribed in a square an equilateral triangle of side 6√2 cm is inscribed in that circle the length of the diagonal of the square is-
A cylinder roller made of iron is 2m long. Its internal radius is 35cm and thickness of iron sheet wed in making is 5 cm. Mass of a roller in kg if 1 cm...
The length of a rectangle, area of which is 105 cm2, is equal to the radius of a circle of area 1386 cm2. Find the perimeter of th...
The area of four walls of a room is 120 cm2. If the length and breadth of the room were equal and the height of the room is 5 cm, then what i...
The radius of a sphere is 18cm. The surface of the sphere is what percent of its volume.
Find out the volume of a tetrahedron whose side is 6√2 cm³?
Find the minimum length of a rubber band which can tie three circular pipe of radius 21 cm?
Length of a rectangle is equal to the side of a square. If area of the square and rectangle is 529 m2 and 299 m2, respectively the...
