Re: Stats doubt

Posted by Tanushree on Jun 12, 2014; 3:54am
URL: http://discussion-forum.276.s1.nabble.com/Stats-doubt-tp7592360p7592433.html

Can some one help me with detailed answers for

Q1. 10 outcomes of a random variable were recorded. The sample mean is 0 and sample variance is 4. It is discovered that two outcomes were recorded incorrectly: one outcome was -5 instead of -6 and another was 11 instead of 12. What is correct variance?

a) 4            b) 3.6              c) 7.4                 d) 5.2

Q2. Amit has a box with 6 red and 3 green balls. Amita has a box with 4 red and 5 green balls. Amit randomly draw a ball and put it into Amita's box and Amita too randomly pics up a ball from her box. What 's the probability that the ball drawn by the two were of diff colors.

a) 1/3         b) 2/15       c) 4/15          d) 7/15

Q3. A traffic light on the way to the University is red 40% of the time. What's the probability of getting red  light (i) two days in a row, (ii) two out if three days.
 
a) 0.16 & 0.20     b) 0.16 & 0.29     c) 0.24 & 0.29      d) none of the above

Which book should I go for cost functions, production function and market sums?