Please give the answer of each question.

12. If X is random variable then P(X s x) is a non-decreasing function of X. It is denoted by Fx(x) and is called (i) probability mass function (ii) probability density function (iii) probability distribution function (iv) cumulative distribution function 13. can be used as a model if one needs to study the number of accidents that takes place in different months at a junction of two roads. (i) Binomial distribution (ii) Poisson distribution (iii) Hypergeometric distribution (iv) Normal distribution 14. distribution is used to draw inference on population mean when population variance is not known and sample size is large. (i) Normal distribution (ii) t - distribution (iii) F - distribution (iv) Chi-square distribution 15. theorem states that if sample size is sufficiently large then for any statistic 't [-F(Q) VV(t) , has normal distribution. (i) Baye's theorem (iii) Chebyshev's theorem (ii) Central limit theorem (iv) Multiplication theorem 16. In construction of confidence interval 1 - o is called (i) level of significance (ii) confidence level (iii) confidence limit (iv) confidence interval 17. A sample statistic 't' is said to be for parameter 0 of population if E (t) = 0. (i) consistent (ii) sufficient (iii) unbiased (iv) efficient 18. Let V be normal approximation of binomial random variable X, then P(X 2 12) = (i) P(V > 11.5) (ii) P(V > 11.5) (iii) P(V = 12.5) (iv) P(V