If E denotes expectation, the variance of a random variable X is given by
E[X^2] – E^2[X]
E[X^2] + E^2[X]
E[X^2]
E^2[X]
Difficulty Level: 1
Positive Marks: 1.00
Negative Marks: 0.33
Px(x) = M exp(–2|x|) – N exp(–3 |x|) is the probability density function for the real random

variable X, over the entire x axis. M and N are both positive real numbers. The equation relating

M and N is

M + N = 1
M + N = 3
Difficulty Level: 1
Positive Marks: 1.00
Negative Marks: 0.33
The standard deviation of a uniformly distributed random variable between 0 and 1 is
1/√3
1/√12
5/√12
7/√12
Difficulty Level: 1
Positive Marks: 1.00
Negative Marks: 0.33
X and Y are two independent random variables with variances 1 and 2, respectively. Let

Z = X– Y. The variance of Z is

1
5
3
6
Difficulty Level: 1
Positive Marks: 1.00
Negative Marks: 0.33
A fair coin is tossed 10 times .What is the probability that ONLY the first two tosses will yield heads.

Difficulty Level: 1
Positive Marks: 1.00
Negative Marks: 0.33
Consider the following variables are given to you:

Population mean = 310, Standard deviation = 50, Size of the sample = 16, Sample mean = 290

Calculate the t-distribution value.

-1.60
-2.00
-0.5
None
Difficulty Level: 1
Positive Marks: 1.00
Negative Marks: 0.33
Urn A consists 3 blue and 4 green balls while another urn B consists 5 blue and 6 green balls. One ball is drawn at random from one of the urns and it is found to be blue. Determine the probability that it was drawn from urn B?
25/32
35/68
12/13
25/68
Difficulty Level: 1
Positive Marks: 1.00
Negative Marks: 0.33
The number of observations in a group is 40. If the average of the first 10 is 4.5 and that of the remaining 30 is 3.5, then the average of the whole group is
20/21
15/4
7/8
25/32
Difficulty Level: 1
Positive Marks: 1.00
Negative Marks: 0.33
Consider a continuous random variable probability density function

The standard deviation of the random variable is:

1/√3
1/√6
1/3
1/6
Difficulty Level: 1
Positive Marks: 2.00
Negative Marks: 0.66
Suppose we uniformly and randomly select a permutation from the 20! Permutations of 1, 2, 3... 20. What is the probability that 2 appears at anearlier position than any other even number in the selected permutation?
1/2
1/10
9!/20!
None of these
Difficulty Level: 1
Positive Marks: 2.00
Negative Marks: 0.66
What’s the mean, mode and median of the messages received on 7 consecutive days 7,13,5,9,6,5,10?
9,9,0
8,9,9
8,7,9
6,8,9
Difficulty Level: 1
Positive Marks: 2.00
Negative Marks: 0.66
0
2
6
3
Difficulty Level: 1
Positive Marks: 2.00
Negative Marks: 0.66
If x̄1 and x̄2 are the means of two distributions such that x̄1 < x̄2 and x̄ is the mean of the combined distribution, then
Difficulty Level: 1
Positive Marks: 2.00
Negative Marks: 0.66
Compute the probability of getting at least 5 heads on tossing a fair coin for 6 times using the binomial distribution
1/2
2/17
7/24
5/6
Difficulty Level: 1
Positive Marks: 2.00
Negative Marks: 0.66
Consider a random variable X that takes values +1 and −1 with probability 0.5 each. The values of the cumulative distribution function F(x) at x = −1 and +1 are
0 and 0.5
0 and 1
0.5 and 1
0.25 and 0.75
Difficulty Level: 1
Positive Marks: 2.00
Negative Marks: 0.66
20 students are selected at random from a clinical psychology class; find the probability that their mean GPA is more than 5. If the average GPA scored by the entire batch is 4.91, the standard deviation is 0.72.

9.13%
0.2%
2.05%
None
Difficulty Level: 1
Positive Marks: 2.00
Negative Marks: 0.66
Find the Taylor Series for
Difficulty Level: 1
Positive Marks: 1.00
Negative Marks: 0.33
384
Difficulty Level: 1
Positive Marks: 1.00
Negative Marks: 0.00

Find the critical points of f.

2,3
2,-1
1,2
0,2
Difficulty Level: 1
Positive Marks: 1.00
Negative Marks: 0.33
-7
-5
1
3
Difficulty Level: 1
Positive Marks: 1.00
Negative Marks: 0.33

Find the coordinates of a point on the parabola y = x2 + 7x + 2

which is closest to the straight line y = 3x – 3.

(-2,-5)

(-2,-8)

(1,2)

(1,-5)

Difficulty Level: 1
Positive Marks: 2.00
Negative Marks: 0.66
Find the value of ‘m’ at which the function is continuous at x = 9

(Upto 2 decimals)

7.44
Difficulty Level: 1
Positive Marks: 2.00
Negative Marks: 0.00
Consider the function on the interval [0.1, 2]. Find the values of x for which has its global maximum and minimum.
Max at 0.1 and Min at 1
Max at 0 and Min at 2
Max at 0.1 and Min at 2
Max at 0.1 and Min at 3
Difficulty Level: 1
Positive Marks: 2.00
Negative Marks: 0.66
Evaluate the limit by applying L’Hôpital’s rule.

0
Difficulty Level: 1
Positive Marks: 2.00
Negative Marks: 0.00
Consider the polynomials p(x) = 1+3x+2x^2 , q(x) = 3 + x + 2x^2 and r(x) = 2x + x^2 in P2. then, {p(x), q(x), r(x)} is
linearly dependent
linearly independent
Both are correct
None of these
Difficulty Level: 1
Positive Marks: 1.00
Negative Marks: 0.33
The matrix A has (1, 2, 1)T and (1, 1, 0)T as eigenvectors, both with eigenvalue 7, and its trace is 2. Find the determinant of A
-588
500
-239
400
Difficulty Level: 1
Positive Marks: 1.00
Negative Marks: 0.33
Suppose the matrix

has a certain complex number λ ≠ 0 as an eigenvalue.

Which of the following numbers must also be an eigenvalue of A ?

λ + 20
λ - 20
-λ + 20
20 - λ
Difficulty Level: 1
Positive Marks: 1.00
Negative Marks: 0.33
Suppose that P is a 4 x 5 matrix such that every solution of the equation Px = 0 is a scalar multiple of [2 5 4 3 1]T. The rank of P is
4
Difficulty Level: 1
Positive Marks: 1.00
Negative Marks: 0.00

Then, s {x1, x2, x3, x4 } is

linearly dependent
linearly independent
Both are correct
None of these
Difficulty Level: 1
Positive Marks: 2.00
Negative Marks: 0.66
then find the value of a^3 + b^3 + c^3 .
4
Difficulty Level: 1
Positive Marks: 2.00
Negative Marks: 0.00
0,1,2
0,2,3
0,-1,-12
None
Difficulty Level: 1
Positive Marks: 2.00
Negative Marks: 0.66
Solve the following equations by matrix inversion

2x + y + 2z = 0 ; 2x – y + z = 10 ; x + 3y – z = 5

x = 85/13 ; y = -30/13 ; z = -70/13
x = 12/13 ; y = ½ ; z = 3/13
Both of the above
None of the above
Difficulty Level: 1
Positive Marks: 2.00
Negative Marks: 0.66
Let A be a square matrix of size: n x n (n > 1). The elements of A {aij} are given by-

The determinant of A is

0
1
n!
(n!)^2
Difficulty Level: 1
Positive Marks: 2.00
Negative Marks: 0.66