Please HELP ME to solve these...
Attachment 19312Attachment 19310
Q6: 0.6472, (i)2.328, (ii)0.8171
Q7: (i)0.223, (ii)0.934, (iii)0.050
For (3), since the puzzle on Monday has been solved, he is only left with 4 puzzles to solve. This is a case of a binomial distribution.
X~B(4 , 3/4)
Then calculate P(X>=3)
Set up a probability distribution table, with Y=0,1,2,3,>3. Calculate their respective probabilities. Then E(x) and Var(x) will follow.
Next, find the mode of the distribution. This is similar to the question asked in your previous post.