1
NDA 2017 Paper 1
MCQ (Single Correct Answer)
+2.5
-0.83
The variance of 20 observations is 5. If each observation is multiplied by 3, then what is new variance of the resulting observations?
2
NDA 2017 Paper 1
MCQ (Single Correct Answer)
+2.5
-0.83
The mean of a group of 100 observations was found to be 20. Later, it was found that four observations were incorrect, which were recorded as 21, 21, 18 and 20. What is the mean if the incorrect observation are omitted?
3
NDA 2017 Paper 1
MCQ (Single Correct Answer)
+2.5
-0.83
The mean weight of 150 students in a certain class is 60 kg. The mean weight of boys in the class is 70 kg and that of girls is 55 kg. What is the number of boys in the class?
4
NDA 2017 Paper 1
MCQ (Single Correct Answer)
+2.5
-0.83
If two regression lines between height (x) and weight (y) are 4y $$-$$ 15x + 410 = 0 and 30x $$-$$ 2y $$-$$ 825 = 0, then what will be the correlation coefficient between height and weight?
Questions Asked from Statistics (Marks 2.5)
Number in Brackets after Paper Indicates No. of Questions
NDA Subjects
Mathematics
Algebra
Sets, Relations and Functions Logarithms Quadratic Equations and Inequalities Sequence And Series Binomial Theorem Matrices Determinants Permutations and Combinations Probability Complex Numbers Vector Algebra Three Dimensional Geometry Statistics
Trigonometry
Trigonometric Angles and Equations Inverse Trigonometric Function Height and Distance Properties of Triangles
Coordinate Geometry
Calculus
English
General Studies