Question
The mean weight of 20 athletes is 70.2 kg. If weights of
two athletes are excluded, the mean of the remaining becomes 69.5 kg. Calculate the average weight of the two excluded athletes.Solution
ATQ,
Total weight of 20 athletes = 20 × 70.2 = 1404 kg
Total weight after excluding 2 athletes = 18 × 69.5 = 1251 kg
Sum of weights of the 2 athletes = 1404 - 1251 = 153 kg
Average weight of the 2 athletes = 153 ÷ 2 = 76.5 kg
The volume of a cube is 512 cm³. If the cost of painting the cube is Rs. 6 per cm², then find the cost of painting five faces of the cube.
'A storage room has a floor area covered with tiles of size 60 cm × 40 cm. If the room measures 4.8 meters in length and 3.2 meters in width, how many ...
If the two adjacent sides of a rectangle are x cm and x – 10 cm and its perimeter is 72 cm then find its area?
The area of a square is given as 3025 cm², and the ratio between the side of the square and the length of a rectangle is 11:10. ...
When the area of a square carpet is 676 m2 then what will be the perimeter of the rectangle whose length is 4 more than the side of the squar...
A diagonal of a rhombus is 6 cm. If its area is 24 cm, then the length of each side of the rhombus is?
What is the difference between (in m2) the area of a circular field of radius 21 metres and area of a rectangular piece of land having its di...
If perpendicular and base of a right-angle triangle are 6 cm and 8 cm respectively, then find the length of the shortest median of triangle.
- The volume of a cube is 729 cm 3 . If the cost of painting the cube is Rs. 10 per cm 2 , then find the cost of painting five faces of...
A rectangular piece of land has a perimeter of 22 metres and length of 5 metres. If the area of the land is to be divided into 6 equal portions, then wh...
Relevant for Exams:
