Question 5: Roll two fair dice and let X be the sum of the two numbers faced up. a. Find the probability distribution of X . b. What is the expected value of X? c. What is the variance of X ?
Question 5: Roll two fair dice and let X be the sum of the two numbers...
The expected sum of two fair dice is 7; the variance is 35/6. Let X be the sum after rolling n pairs of dice. Use Chebyshey's inequality to find z such that P(|X – 7n< z) > 0.95. In 10,000 rolls of two dice there is at least a 95% chance that the sum will be between what two numbers?
8. We roll two fair dice. (1) Given that the roll results in a sum of 6 or less, what is the conditional probability that doubles are rolled? A "double" means that two dice have the same number (2) Given that the two dice land on different numbers, what is the conditional proba- bility that at least one die roll is a 1?
Questions 1-7: Hector will roll two fair, six-sided dice at the same time. Let A = the event that at least one die lands with the number 3 facing up. Let B = the event that the sum of the two dice is less than 5. 1. What is the correct set notation for the event that “at least one die lands with 3 facing up and the sum of the two dice is less than 5”? 2. Calculate the...
Roll two fair six-sided dice, and let X, Y denote the first and the second numbers.If Z=max {X, Y}, find- E(Z)- V(Z)If Z=|X-Y|, find- E(Z)- V(Z)
Consider a roll of a pair of fair dice. Let X = absolute value of the difference of the two dice. What are the possible values that X can take on? Derive both the mass function and the distribution function for X.
Suppose you roll two fair dice and the dice add up to. For each possible value of s ∈ {2, 3, . . . , 12},let Fs be the event that the dice sum to. Then determine the probability that, given that Fs occurs, the two dice multiply to a number less than 15.
Two dice are rolled repeatedly until the sum of the two numbers rolled is 10 or more. a) What is the probability that exactly 5 rolls are needed? (Count each time you roll the dice as one roll). b) What is the probability that more than 5 rolls are needed? c) Find the expected number of rolls.
Exercise 10.17. We flip a fair coin. If it is heads we roll 3 dice. If it is tails we roll 5 dice. Let X denote the number of sixes among the rolled dice. (a) Find the probability mass function of X. (b) Find the expected value of X.
3. Two fair dice are thrown. Let X be the smaller of the two numbers obtained (or the common value if the same number is obtained on botih dice). Find the probability mass function of X. Find P(X>3).
5. What is the correct set notation for the event that "the sum of the two dice is not less than 5 if at least one die lands with 3 facing up"? 6. Calculate the probability that the sum of the two dice is not less than 5 if at least one die lands with 3 facing up. 7. Are A and B independent? Explain your reasoning. Use for Questions 1-7: Hector will roll two fair, six-sided dice at the...