Kindly Solve these Questions
 

Q1:
Three groups of children contain three girls and one boy, two girls and two boys and one girl and three boys respectively. One child is selected at random from each group. Find the probability that the three selected children include one girl and two boys.

Q2:
When the circuit boards used in the manufacture of compact disc players are tested, the long run percentage of defectives is 5%. let x= the number of defective boards in a random sample of size n=25. determine:
a) P(1< x< 4)
b)the probability that none of the 25 boards are defective.
c)the expected value and standard deviation of x

Q1 : Write down all possible combinations .. (3!/2!= 3 combinations) GBB , BGB, BBG . Now add up these probabilities

Q2: Use binomial .. P =0.95
Mean =np
Sd = root(npq)

Dear Bilal also solve this question for me:
Q: A fair coin is flipped 5 times. what is the exact probability that the sample proportion of heads is within 0.05 to 1/2?

Thank you,

Convert it into a normal approximation :)

would you please tell me just the answer of the question. I have sorted out the way to solve but just to know if i am doing right.