# PG TRB MATHS FREE ONLINE TEST-1

PG TRB MATHS FREE ONLINE TEST-1

## PG TRB MATHS ONLINE TEST – 1

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PG TRB MATHS ONLINE TEST

1 / 10

1.If the sum of the squares of the rank difference of 9 pairs is 80 the correlation

coefficient between them is.

2 / 10

2.The odds that the person X speaks the truth are 3:2 and the odds that a person Y

epeaks the truth are 5:3 In what percentage of cases are they likely to contradict each other an identical point

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3.A box contains bred, 4 white and 5 black balls, A person draw 4 balls from the box at

random find the probalility that among the balls draw there is atleast one ball in each colour

4 / 10

4.A box contains 5 red and 4 white balls. 2 balls are drawn succeesively from the box

without replacement and it is noticed that second one is white .what is the probability that is also white.

5 / 10

5.f(x) = { Ae5' is a pprobabilits density fuction of a continuous random variable

lo, otherwise X, then the value of A is,

6 / 10

6.If the regression line Coinside then which of the following is false?

7 / 10

7.The variance of first 13 natural numbers is

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8. A random variable X assumes only value +1 and -1 each with equal probabilities E(X) is equal to

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.

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10.The first three moments of a distribution about the value 2 variable are 1,16 and -40,

then find My. H'z