Question

In: Statistics and Probability

Problem(1) (a) Consider the (random) experiment of throwing THREE coins together. Let S denote the sample...

Problem(1) (a) Consider the (random) experiment of throwing THREE coins together. Let S denote the sample space. List the elements in S.

(b) If HEAD comes up, you win $2 dollars; you lose $1 dollar if TAIL shows up. Let X be the random variable that corresponds to the money you win (a positive value) or lose (a negative value). What are the values that the random variable X takes?

(c) Suppose that the coin is made and thrown fairly. Find P[X = 2].

(d) Find E[X].

(e) Find E[X2 ].

(f) Find V ar[X].

Solutions

Expert Solution

When we throw three coins together then the sample space is given by


Related Solutions

2. (a) Let (a, b, c) denote the result of throwing three dice of colours, amber,...
2. (a) Let (a, b, c) denote the result of throwing three dice of colours, amber, blue and crimson, respectively., e.g., (1, 5, 3) represents throwing amber dice =1, blue dice = 5, crimson dice = 3. What is the probability of throwing these three dice such that the (a, b, c) satisfy the equation b2 − 4ac ≥ 0? [7 marks] (b) From a survey to assess the attitude of students in their study, 80% of them are highly...
A random experiment consists of throwing a triangular shape with three faces three times. The first...
A random experiment consists of throwing a triangular shape with three faces three times. The first face has the number 1, the second face has the number 2 and the third face has the letter A. List the sample space of the random experiment.    Assume the faces are equally likely, what is the probability an outcome of experiment has at least one A?                                                                                                   the letter A is three times likely to occur in a throw than the...
2.2.6. Let S be a subset of a group G, and let S^-1 denote {s^-1: s...
2.2.6. Let S be a subset of a group G, and let S^-1 denote {s^-1: s ∈ S}. Show that 〈S^-1〉 = 〈S 〉. In particular, for a ∈ G, 〈a〉 = 〈a^-1〉, so also o(a) =o(a^-1)
: Let X denote the result of a random experiment with the following cumulative distribution function...
: Let X denote the result of a random experiment with the following cumulative distribution function (cdf): 0, x <1.5 | 1/ 6 , 1.5<=x < 2 | 1/ 2, 2 <= x <5 | 1 ,x >= 5 Calculate ?(1 ? ≤ 6) and ?(2 ≤ ? < 4.5) b. Find the probability mass function (pmf) of ? d. If it is known that the result of the experiment is integer, what is the probability that the result is...
1)Design the sample space for an experiment where you will flip three coins into the air,...
1)Design the sample space for an experiment where you will flip three coins into the air, first one, then the second, and finally the third to examine the faces landing upwards. Use the sample space to answer the questions that follow. Probabilities should be expressed as decimals. A) Please identify the sample space for this experiment. B) What is the probability of at least one head showing? C) What is the probability of exactly one tail showing? D) What is...
Consider the experiment of rolling a six-sided fair die. Let X denote the number of rolls...
Consider the experiment of rolling a six-sided fair die. Let X denote the number of rolls it takes to obtain the first 5, Y denote the number of rolls until the first 2, and Z denote the number of rolls until the first 4. Numerical answers are needed only for parts (a) and (b). Expressions are sufficient for parts (c), (d), and (e). a) E[X|Y = 1 or Z = 1] b) E[X|Y = 1 and Z = 2] c)...
Consider an experiment in which three different coins (say a penny, a nickel, and a dime...
Consider an experiment in which three different coins (say a penny, a nickel, and a dime in that order) are tossed and the sequence of heads and tails observed. For each of the following pairs of events, A and B, give the subset of outcomes that defines the events and state whether the pair of events are mutually exclusive, collectively exhaustive, neither or both. (a) A: The penny comes up heads. (b) A: The penny comes up heads. B: The...
A problem experiment is conducted in which the sample space of the experiment is S= {1,2,3,4,5,6,7,8,9,10,11,12},...
A problem experiment is conducted in which the sample space of the experiment is S= {1,2,3,4,5,6,7,8,9,10,11,12}, event F={7,8}, and event G={9,10,11,12}. Assume that each outcome is equally likely. List the outcomes in F and G. Find P(F or G) by counting the number of outcomes in F or G. Determine P(F or G) using the general addition rule.
Let X be the random variable for the number of heads obtained when three fair coins...
Let X be the random variable for the number of heads obtained when three fair coins are tossed: (1) What is the probability function? (2) What is the mean? (3) What is the variance? (4) What is the mode?
Let S = {1, 2, 3, 4, 5, 6, 7} be a sample of an experiment...
Let S = {1, 2, 3, 4, 5, 6, 7} be a sample of an experiment and let X = {1, 4, 7}, Y = {2, 3, 5}, and Z = {1, 3, 5} be events. Which of the following statements is correct? a) X and S are mutually exclusive events. b) X and Y are mutually exclusive events. c) X, Y, and Z are mutually exclusive events. d) Z and Y are mutually exclusive events. e) X and Z...
ADVERTISEMENT
ADVERTISEMENT
ADVERTISEMENT