Maths n Stats

Posted by Ram on Apr 28, 2012; 7:53am
URL: http://discussion-forum.276.s1.nabble.com/Maths-n-Stats-tp7508328.html

1.The no.of ways selecting 10 balls out of an unlimited no.of white,red,green and blue balls is
a) 236    b)256   c)276   d)286

2. The no.of ways in which an examiner can assign 20 marks to 4 questions giving not less than    
two marks to a question is
a)280     b)365    c)455   d)545

3.Number of continuous functions characterized by the equation
x f (x) + 2 f (-x) = -1 , where x is any real number, is            (ISI 2011)
(a) 1, (b) 2, (c) 3, (d) None of these

4.Q.no. 24 of ISI 2011

5.In an analysis of bivariate data (X and Y) the following results were obtained.
Variance of X (s x2) = 9 , product of the regression coefficient of Y on X and X on Y is 0.36, and the regression coefficient from the regression of Y on X (b yx ) is 0.8.
The variance of Y is
(a) 16    (b) 4     (c) 1.69     d)3

Plz give explanations to your answers. Thanks in advance.....