Re: ISI 2015 PEA Answer Key - Discuss

Posted by onionknight on Apr 30, 2015; 1:32am
URL: http://discussion-forum.276.s1.nabble.com/ISI-2015-PEA-Answer-Key-Discuss-tp7596123p7596422.html

Standard deviation won't change. The answer for 23 is B.

2.) Can you draw a continuous function (i.e. without lifting the tip of your pen) ranging from 0 to 1 without passing 1/2? I don't think you can. So that makes it D.

3.) f(x)  =  -2x+6 X<2
               f(2) =2
                 2       2<X<4

right derivative= lim h-> 0 (f(2+h)-f(2)) /h = 0
left derivative = lim h->0   (f(2-h)-f(2)) /h = -2

8.) Firstly, the question itself says x>=0 so rule out all negative numbers. for sqrt(x2-1) to be defined x2-1 must be non negative which means x must lie in  [1, infinity) . For log(sqrt(1-x)) to  be defined  1-x must be positive which means x must lie in [0,1). The intersection of these two sets is null set