PG TRB MATHS FREE ONLINE TEST-1 November 27, 2022September 30, 2021 PG TRB MATHS FREE ONLINE TEST-1 PG TRB MATHS ONLINE TEST – 1 54 Created on September 29, 2021 PG TRB MATHS ONLINE TEST 1 / 10 1.If the sum of the squares of the rank difference of 9 pairs is 80 the correlationcoefficient between them is. (a) 0.667 (b) 3.33 (C) 0.333 (d) None 2 / 10 2.The odds that the person X speaks the truth are 3:2 and the odds that a person Yepeaks the truth are 5:3 In what percentage of cases are they likely to contradict each other an identical point (a) 4.75% (b) 47.5% (c) 37.5% (d) 49.5% 3 / 10 3.A box contains bred, 4 white and 5 black balls, A person draw 4 balls from the box atrandom find the probalility that among the balls draw there is atleast one ball in each colour (a) 0.5275 (b) 0.2575 (c) 0.1275 (d) none 4 / 10 4.A box contains 5 red and 4 white balls. 2 balls are drawn succeesively from the boxwithout replacement and it is noticed that second one is white .what is the probability that is also white. A)5/8 B) 11/8 (C)3/8 (d) none of these 5 / 10 5.f(x) = { Ae5' is a pprobabilits density fuction of a continuous random variablelo, otherwise X, then the value of A is, (a)-1/5 (b) -5 (c) 1/5 (d) 5 6 / 10 6.If the regression line Coinside then which of the following is false? (a)r = 1 (b) r = -1 (c) r = 0 (d) r = + 1 7 / 10 7.The variance of first 13 natural numbers is (a) 12 (b) 13 (C) 14 (d) 15 8 / 10 8. A random variable X assumes only value +1 and -1 each with equal probabilities E(X) is equal to (a) 1 (b) 0 (c) 1/2 (d) 3/4 9 / 10 9.Karl pearson coefficient of skewness is -0.7 and the value of the median and standard derivation are 12.8 and 6 respectively, Find the mean. (a) 10.14 (b) 11.4 (c) 12.6 (d) 9.14 10 / 10 10.The first three moments of a distribution about the value 2 variable are 1,16 and -40,then find My. H'z (a) 15 and 86 (b) -15 and -86 (c) 15 and -86 (d) 15 and -46 Your score is The average score is 35% LinkedIn Facebook Twitter VKontakte 0% Restart quiz WhatsApp Facebook Twitter Messenger Email Related