Quantitative Aptitude - Arithmetic Ability Questions

The mean of a distribution is 18 and the standard deviation is 4.5. What is the value of the coefficient of variation?

Consider two-digit numbers which remain the same when the digits interchange their positions. What is the average of such two-digit numbers?

The value of 2.31 x 0.34 = ?

Which of the following numbers is completely divisible by 99?

A Village lost 12% of its goats in a flood and 5% of remainder died from diseases. If the number left now is 8360. What was the orignal number before the flood?

If sin8 θ + cos8 θ – 1 = 0, then what is the value of cos2 θ sin2 θ (If θ ≠ 0 or π/2)?

The volume of a right circular cone, whose radius of the base is same as one-third of its altitude, and the volume of a sphere are equal. The ratio of the radius of the cone to the radius of the sphere is :

Yaman sold an item at a loss of 10%. If he had sold it for Rs.57 more, he would have made a profit of 20%. What should be the selling price of the item to make a profit of 30%?