Q1 · hard · AI-verified
The coefficient of variation of two series A and B are 60% and 70% respectively, and their standard deviations are 21 and 35. What are the means of A and B respectively?
- 35 and 50
- 35 and 40
- 40 and 50
- 30 and 45
Q2 · hard · AI-verified
The mean deviation about the mean of the data 4, 7, 13, 16 is:
- 4.5
- 4
- 3.5
- 5
Q3 · hard · AI-verified
Three cards are drawn at random from a pack of 52 cards without replacement. What is the probability that all three cards are kings?
- 1/1105
- 4/2197
- 1/5525
- 1/2197
Q4 · hard · AI-verified
Events A and B are such that P(A)=1/2, P(B)=1/3 and P(A∩B)=1/4. What is P(A'∩B')?
- 1/3
- 5/12
- 7/12
- 1/4
Q5 · hard · AI-verified
In a Poisson distribution, if P(X=1)=P(X=2), what is the mean of the distribution?
- 1/2
- 1
- 2
- 3