From a lot of 10 items containing 3 defectives, a sample of 4 items is drawn at random without replacement. The expected number of good items is;

1.  3

2.  2.8

3.  1.2

4.  1.8

View Answer  
4
Correct Answer :

2.8


Explanation :
No Explanation available for this question

A random variable X has its range X={0, 1, 2} and the probabilities are given by P(x=0)=3k2,P(X=1)=4K-10K2,P(X=2)=5K-1 where k is a constant, P(0 < X < 3) is:

1.  3/49

2.  27/49

3.  37/49

4.  47/49

View Answer  
4
Correct Answer :

37/49


Explanation :
No Explanation available for this question

The probability of getting qualified in IT JEE and EAMCET by a student are respectively 1/5 and 3/5. The probability that the student gets qualified for at least one of these tests is:

1.  3/25

2.  17/25

3.  22/25

4.  8/25

View Answer  
4
Correct Answer :

17/25


Explanation :
No Explanation available for this question

The probability of choosing at random number divisible by 6 or 8 from among 1 to 90 numbers is:

1.  1/6

2.  11/90

3.  1/30

4.  23/90

View Answer  
4
Correct Answer :

23/90


Explanation :
No Explanation available for this question

7 Coupons are numbered 1 to 7. Four are drawn one by one with replacement. The probability that the least number appearing on any selected coupon is greater then or equal to 5 is

1.  (3/7)4

2.  6/73

3.  4/73

4.  (3/4)4

View Answer  
4
Correct Answer :

(3/7)4


Explanation :
No Explanation available for this question

A and B are two events such that If A and B are independent events then P(B)=

1.  1.5

2.  2.5

3.  3/5

4.  4/5

View Answer  
4
Correct Answer :

3/5


Explanation :
No Explanation available for this question

Counters numbered 1,2,3 are placed in a bag and one is drawn at random and replaced. The operation is being repeated three times. The probability of obtaining a total of 6 is

1.  7/9

2.  6/27

3.  7/27

4.  5/27

View Answer  
4
Correct Answer :

7/27


Explanation :
No Explanation available for this question

S={1, 2, 3……..20} if 3 numbers are chosen at random from S, the probability for they are in A.P. is

1.  3 /38

2.  35/33

3.  33/35

4.  1/38

View Answer  
4
Correct Answer :

3 /38


Explanation :
No Explanation available for this question

An experiment yields 3 mutually exclusive and exhaustive events A, B and C. If P(A)=2P(B)=3P(C) then P(A) =

1.  1/11

2.  2/11

3.  23/11

4.  6/11

View Answer  
4
Correct Answer :

6/11


Explanation :
No Explanation available for this question

Three cards are drawn successively with replacement. The probability of obtaining 2 aces and 1 king is

1.  1/133

2.  2/133

3.  3/133

4.  5/133

View Answer  
4
Correct Answer :

3/133


Explanation :
No Explanation available for this question
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