CBSE - Aptitude Mathematics

Standard deviation is greater than 1. arithmetic mean 2. geometric mean 3. harmonic mean 4. depends on the data

Which one of the lines x + 4y=3 and y+3x=15 is the regression line of y on x? 1. x+4y=3 2. y+3x=15 3. x+3y=4 4. None

If 8a = 6b and 3a = 0 then 1. a and b are equal 2. a = 6 3. a = 6 and b = 8 4. None of these

The system of equations: x+4y-2z=3, 3x+y+5z=7, 2x+3y+z=5 has: 1. a unique solution 2. no solution 3. an infinite number of solution 4. None of these

In the geometric mean of x, 16, 50, be 20, then the value x is: 1. 40 2. 20 3. 10 4. 4