670 Answered Questions for the topic Probability & Statistics

If p(a) is 0.3, p(b) is 0.6, p(a and b) is 0.3, what is p(a or b)?

Need to know P(A or B)

4 cards are drawn from a standard deck without replacement. What is the probability that at least one of the cards drawn is a spade?

4 cards are drawn from a standard deck without replacement. What is the probability that at least one of the cards drawn is a spade?

only 10 tickets were sold; you and a friend each bought 1 ticket. What is the probability the first prize and you will get the second prize?

Assume that a lottery was conducted in a small office and only 10 tickets were sold; you and a friend each bought 1 ticket. Two winners will be selected. What is the probability that your friend... more

Finding the possible values for probabilities?

Consider 3 trials, each having the same probability of success. Let X denote the total number of successes in these trials. If E[X} = 0.6, find each of the following.(a) The largest possible value... more

Math probability

How many different(distinct) 13 digit passwords can be created using letters and digits with repetition?

I need help with 1) Y~B(10, 0.5) Compute P(1<Y<4)= 2) Mean of 𝑥 =10, Variance of 𝑥 =16 and 𝑥 has a Normal Distribution Pr(5< 𝑥 <17)=?

i need a help with my question for homework . i need help because the professor went a quit fast in the online class. he doesn't provide good example. If anyone wanna explain it to me to how to do... more

Finding Cov(4X,4X+2Y)

Let X and Y be stochastic variables. Assume Var(X)=1.74 and Cov(X,Y)=0.79 What is Cov(4X,4X+2Y).  Have tried to use the formulas for Var and Cov to get around this problem, but haven't managed to... more

A bag holds 11 beads. 7 are red, the rest are white. Two beads are taken at random from the bag. What is the proba polity that one bead of each colour is taken?

Need to show my working.. been stuck on this question for my homework for a while now. Answer as a decimal or fraction.

What is the chance Clarice will pick 3 classical CDs?

Clarice has 7 new CDs; 3 are classical music and the rest are pop music. If she randomly grabs 3 CDs to listen to in the car on her way to school, what is the probability that she will select only... more

what is the probability that both customer selected are gaston residents

A department store is holding a drawing to give free shopping sprees to two lucky customers. There are 14customers who have entered the drawing: 5live in the town of Gaston, 5live in Pike, and... more

prob & stat question

A stock broker wishes to put together a portfolio from two types of stocks available A and B. The return on stock A is XA, and the return on stock B is XB. Stock A is less risky, but has less... more

the mean and variance of which distribution are the same

the mean and variance of which distribution are the same

Is there a way to be profitable when gambling on a 50/50 coinflip? (No cointricks, just using statistics and probability)

I have a question on probability I hope you would be able to answer.If you were to gamble another person by method of a coinflip each person would have a 50% chance to win the bet. So if each... more

the access code for a car's security system consists of 6 digits, the first digit cannot be 8 and the last digit must be odd, how many different codes

the access code for a car's security system consists of 6 digits, the first digit cannot be 8 and the last digit must be odd, how many different codes are available

Please Help me to answer this question. Justify your answer please

A student council has five seniors, four juniors, three sophomores, and two freshmen as members. In how many ways can a four member council committee be formed that includes one member of each class?

Please help me to answer these questions for cumulative distribution of the random variable X

The cumulative distribution of the random variable X is given by G(x) = 0                    for x<0            3x2-2x3          for 0≤x<1            1                   for x ≥1 a)Find the... more

99%; n = 17; ʍ is unknown; population appears to be normally distributed

how do i solve for this problem  

A number which consists of three digits is formed from a set of intergers {1,2,3,4,5,6}.Event A,B and C are defined as follows

EVENT A:the number does not contain digit 6 EVENT B:the number consists of three different digit EVENT C:the number begins with digit 3

Is this question is a combination or a permutations? and how to solve it step by step ?

How many licence plates of three symbols (letters and digits) can be made using at least one letter in each? 

In a survey of 100 children, it is found that 47 have at least one brother, 58 have at least one sister and that 32 children have both.

In a survey of 100 children, it is found that 47 have at least one brother, 58 have at least one sister and that 32 children have both. How many of the children have no brothers and sisters?

In a group of 200 school students, 135 are enrolled in sciences classes, 110 are enrolled in accounting classes, and 88 are enrolled in both of the classes.

In a group of 200 school students, 135 are enrolled in sciences classes, 110 are enrolled in accounting classes, and 88 are enrolled in both of the classes. (i) Draw a suitable Venn diagram and... more

Lottery Ticket Chance

You need to pay one dollar to buy an instant lottery ticket. In this instant lottery game, you have 10% chance to win a one dollar bill and 5% chance to win a five dollar bill. You are interested... more

probability question help please

A school’s athletics department can send 3 track athletes and 2 field athletes to an upcoming meet. The school has 14 track athletes and 10 field athletes who qualify. Usecombinations to determine... more
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