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?

Please help me.

Tanushree