NDA questions
2295 published questions with worked solutions.
- Let x be the mean of x_1, x_2, x_3, , x_n. If x_i=a+cy_i for some constants a and c, then what will be the mean of y_1, y_2, y_3,...
- Consider the following statements : 1. Mean is independent of change in scale and change in origin. 2. Variance is independent of...
- What is the median of the numbers 4 6, 0, 9 3, -4 8, 7 6, 2 3, 12 7, 3 5, 8 2, 6 1, 3 9, 5 2?
- In a test in Mathematics, 20% of the students obtained "first class". If the data are represented by a Pie-Chart, what is the...
- The mean and standard deviation of a set of values are 5 and 2 respectively. If 5 is added to each value, then what is the...
- Two fair dice are rolled. What is the probability of getting a sum of 7?
- If A and B are two events such that 2P(A)=3P(B), where 0<P(A)<P(B)<1, then which one of the following is correct?
- One bag contains 3 white and 2 black balls, another bag contains 5 white and 3 black balls. If a bag is chosen at random and a...
- Consider the following in respect of two events A and B : 1. P( A occurs but not B )=P(A)-P(B) if B A 2. P( A alone or B alone...
- A committee of three has to be chosen from a group of 4 men and 5 women. If the selection is made at random, what is the...
- The standard deviation of the first N natural numbers can be obtained using which one of the following formulae?
- What is the value of _7 _7 7 7 7 equal to?
- If an infinite GP has the first term x and the sum 5, then which one of the following is correct?
- A square matrix A is called orthogonal if (where A' is the transpose of A)
- If A, B and C are subsets of a Universal set, then which one of the following is **not** correct? (where A' is the complement of...
- The sum of the series 3-1+ 1 3 - 1 9 + is equal to
- If and ( 0) are the roots of the quadratic equation x^2+ x- =0, then the quadratic expression -x^2+ x+ where x R has
- What is the coefficient of the middle term in the binomial expansion of (2+3x)^4?
- For a square matrix A, which of the following properties hold? 1. (A^ -1 )^ -1 =A 2. (A^ -1 )= 1 A 3. ( A)^ -1 = A^ -1 where is a...
- Which one of the following factors does the expansion of the determinant vmatrix x&y&3 ^2&5y^3&9 ^3&10y^5&27 vmatrix contain?