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Statistics MCQ - Probabilities

46 If each observation of raw data whose variance is σ², is increased by λ, then variance of the new set is

When each item is increased by λ, the S.D. is multiplied by |λ| and variance is multiplied by λ²

47 If mode of a data is 18 and mean is 24, then median is

18 = 3 Median -2 x 24

48 If μ is mean of distribution, then Probability

Probability

Probability

49 b_yxb_xy is equal to

Probability

50 If cov (X, Y) = 0, then which of the following is negative?

Cov (X, Y), b_yx, b_xy and p(X,Y) all are either positive, or 0 or negative simultaneously

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Question:

A man alternately tosses a coin and throw:, a dice, beginning with the coin. Then the probability that he will get a head before he gets a 5…

A. 1/4
B. 3/4
C. 4/5
D. 1/7

Correct answer: B

Explanation:

Let A be the event of getting 5 or 6P(A) = 1/3 and B be the event of getting 1,2,3,4P(B) = 2/3In order to get a 'Head' before…

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