A dice is thrown 100 times, getting an even number is considered a success. The variance of the number of success is
10
25
18
A coin and six faced die, both unbiased, are thrown simultaneously. The probability of getting a head on the coin and an odd number on the die, is
1/2
3/4
1/4
2/3
If A and B are two independent events such that P(A∩B') = 3/25 and P(A' ∩B) = 8/25, then P(A) is
1/5
3/8
2/5
4/5
The probability that at least one of the events A and B occurs is 0.6. If A and B occur simultaneously with probability 0.2, then is
0. 4
0.8
1.2
1.4
If P(A) = P(B) = P(C) = 1/4, P (AB) = P (CB) = 0 and P(AC) = 1/8, then P(A+B) is equal to
5/8
37/64
A number is chosen at random among the first 120 natural numbers. The probability if the number chosen being a multiple of 5 or 15 is
1/8
1/24
1/6
A complete cycle of a traffic light take 60s. During each cycle the light is green for 255, yellow for 5 s and red for 30s. At a randomly chosen time, the probability that the light will not be green, is
1/3
4/12
7/12
If P(A) = P(B) = x and P(A∩B) = P(A'∩B') = 1/3, then x is equal to
The probability that atleast one of A and B occurs is 0.6. If A and B occur simultaneously units probability 0.3, then P(A') + P(B') is
0.9
0.15
1.1
If the random variable X takes the values x1,x2,x3,....x10 with probabilities P(X = xi) = Ki then the value of K is equal to.
1/10
1/55
