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Which one is not non-probability sample method

Which of the following small savings schemes currently has a maturity period of 115 months?

The probability of getting 9 cards of the same suit in one hand at a game of bridge is

If xi | fi , i = 1,2,...n is a frequency distribution with standard deviation 15 and mean 30, the coefficient of variation will be equal to:

Identify, from the following, the moment used as a measure of skewness?

For the discrete distribution, the Pearson's coefficient of skewness β2 is always:

If moment generating function of continuous random variable X is (λ /λ−t) ;t < λ, then E(X³) equals to:

For a distribution, mean is 40, median is 40.5 and mode is 41. The distribution is:

Which of the following is a sources of primary data?