Mathematics
Given that the sum of the squares of the first seven natural numbers is 140, then their mean is :
20
70
280
980
Related Questions
A solid sphere is cut into identical hemispheres.
Statement 1 : The total volume of two hemispheres is equal to the volume of the original sphere.
Statement 2 : The total surface area of two hemispheres together is equal to the surface area of the original sphere.
Which of the following is valid ?
Both the statements are true
Both the statements are false
Statement 1 is true, and statement 2 is false
Statement 1 is false, and statement 2 is true