Question
The meaning of 12 observations is 15. One more
observation is included, and the new mean becomes 17. The 13th observation is.Solution
The mean of 12 observations=15 Total =15×12=180 After including the new observations =12+1=13 New mean =17 Then total=17×13=221 13th observations =221-180=41.
Find the perimeter of a sector which forms a central angle of 150° in a circle of radius 21 cm.
(Use π = 22/7)If the circumference of a circle is 352 cm then find the area of the circle?
A cylindrical drum has internal radius 2 m and height 3.5 m. Find its volume. Take π = 22/7.
In what time would a Cistern be filled by three pipes whose diameter are 2cm, 8/3 cm and 4cm running together, where the largest pipe alone fill it in 1...
A rectangular piece of copper foil of length 63 cm and area 1386 cm2 is folded along its width to form a cylinder such that there is only one...
The sum of the areas of a rectangle and a square is 432 cm². The breadth of the rectangle is 6 cm more than each side of the square. If the length of t...
- The length of a rectangle is the same as the side of a square. If the area of the square is 625 m² and that of the rectangle is 500 m², what is the perim...
A right circular cylinder having total surface area of 2833.6 cm2 is immersed in a vessel completely filled with water. If the height of the ...
Inside a square land having perimeter equal to 120 metres, leaving aside a circular land of radius 14 metres, the remaining land needs to be levelled at...
If both the length and breadth of a rectangle are increased by 5 m, its area increases by 225 m². The ratio of the perimeters of the square and rectang...
Relevant for Exams:
