Tutors Answer Your Questions about Probabilityandstatistics (FREE)
Question 849998: drawing balls from an urn. Anne randomly chooses a single ball from the urn shown here, x represents the color of the ball chosen. Construct a complete probability distribution for the random variable x.
3 red
5 yellow
2 blue
Click here to see answer by stanbon(69061) 
Question 849997: The mean salary offered to students who are graduating from Coastal State University this year is $24,245, with a standard deviation of $3712. A random sample of 85 Coastal State students graduating this year has been selected. What is the probability that the mean salary offer for these 85 students is $23,500 or more?
Carry your intermediate computations to at least four decimal places. Round your answer to at least three decimal places.
Click here to see answer by stanbon(69061) 
Question 850043: Please help, question is; Suppose we select without looking, one marble from a bag containing 6 red marbles and 8 blue marbles.
a)what is the probability of selecting a blue marble on the first try?
b) if you return the marble to the bag, what is the probability of selecting a red marble?
c) if you first selected a red marble and you don't return that marble to the bag, what is the probability of the second draw being a blue marble?
d) Starting over with all the marbles in the bag, how many draws would you need to guarantee blue marble?
Click here to see answer by stanbon(69061) 
Question 850043: Please help, question is; Suppose we select without looking, one marble from a bag containing 6 red marbles and 8 blue marbles.
a)what is the probability of selecting a blue marble on the first try?
b) if you return the marble to the bag, what is the probability of selecting a red marble?
c) if you first selected a red marble and you don't return that marble to the bag, what is the probability of the second draw being a blue marble?
d) Starting over with all the marbles in the bag, how many draws would you need to guarantee blue marble?
Click here to see answer by richwmiller(15954) 
Question 850071: a manufacturer packages bolts in boxes containing 100 each. Each box of 100 bolts contains, on average, 5 defective bolts. the quality control staff randomly selects a box at the end of the day from an entire production run.
A. what is the probability, rounded to four decimal places, that the box will contain exactly 3 defective bolts
B. What is the probability, rounded to four decimal places that the box will contain at most 7 defective bolts?
c. what is the probability, rounded to four decimal places that the box will contain less than 4 defective bolts?
Click here to see answer by ewatrrr(22107) 
Question 850137: Was wondering if someone could give me the probability and the equation to solve the following.
Two teams are to play four games against each other. In each game Team A is 45% to win and team B is 55% to win. What it the probability of Team A winning 2 or more of the games (i.e. 2,3 or 4)? Also if you can show me how to figure it out that would be great.
Thanks
Click here to see answer by ewatrrr(22107) 
Question 850137: Was wondering if someone could give me the probability and the equation to solve the following.
Two teams are to play four games against each other. In each game Team A is 45% to win and team B is 55% to win. What it the probability of Team A winning 2 or more of the games (i.e. 2,3 or 4)? Also if you can show me how to figure it out that would be great.
Thanks
Click here to see answer by rothauserc(2272) 
Question 850143: all the black face cards are removed from a pack of 52 playing cards. the remaining cards are well shuffld and then a card is drawn at random. find the probability of getting a
1. face card
2. red card
3. black card
4. king
Click here to see answer by ewatrrr(22107) 
Question 850328: Maggie is applying to college. There are only two outcomes for each application. It is either accepted or rejected. Each application she sends has a 0.70 probability of being accepted. She applies to 10 colleges. (2 points)
What is the expected value and variance for the random variable “number of acceptances”?
Click here to see answer by swincher4391(1075) 
Question 850608: An experiment consists of choosing one card from a standard deck and then replacing it. The experiment was done several times and the results are :8 hearts, 8 diamonds, 6 spades, and 6 clubs. Find the experimental probability that a card is red
Click here to see answer by jim_thompson5910(33401) 
Question 850728: In a hockey match,both teams A& B scored same number of goals up to the end of the game, so to decide the winner, referee asked both the captains to throw a die alternatively and decided that the team, whose captain gets a six first, will be declared the winner. If the captain of team A was asked to start, find their respective probabilities of winning the match and state whether the decision of the referee was fair or not.
Click here to see answer by richwmiller(15954) 
Question 850750: 1. A random sample of size n = 25 is chosen from a normal population with known mean, m=8, and s.d., s = 4.
I know the sampling distribution of the sample mean is .8 but I don't understand this question:
Determine the probability of having a sample mean less than 7.
or
having a sample mean between 7 and 9.
I just need to figure out how to do this because I can't figure it out, if you could explain it to me!
Click here to see answer by ewatrrr(22107) 
Question 850781: the following observation have been arranged in ascending order if the median of the data is 63,find the value of x.29,32,48,50,x,x+2,72,78,84,95.
Click here to see answer by richwmiller(15954) 
Question 850781: the following observation have been arranged in ascending order if the median of the data is 63,find the value of x.29,32,48,50,x,x+2,72,78,84,95.
Click here to see answer by ewatrrr(22107) 
Question 850846: What is the mean of the following scores?
450,620,410,405,444,560,511,501,455,476,477,487,496,491,555,587,
465,467,495,434,334,432,321,667,564,656,781,757,723,768,871,345,
432, 345, 675, 689,633, 641, 600, 535, 456, 543, 541, 734, 766, 721,
Click here to see answer by Fombitz(25151) 
Question 850815: A hat contains 3 marbles. one orange, one blue, and one yellow. Two marbles are selected at random with out replacement from the hat.
A) Determine the number of points in the sample.
B) Determine the probability of selecting exactly 1 orange marble.
C) Determine the probability of selecting 1 marble that is not orange.
D) Determine the probability of selecting no blue marbles.
Click here to see answer by Fombitz(25151) 
Question 850818: Based on his past baseball history, Kurt has a (n) 15% chance of reaching first base safely, a (n) 7% chance of hitting a double, a (n) 5% chance of hitting a triple. a (n) 5% chance of hitting a home run, and a (n) 68% chance of making an out at his next at bat.
Determine Kurt's expected number of bases for his next at bat.
Click here to see answer by Theo(5548) 
Question 850787: The Probability of getting a defective Widget is .10 You select five widgets =
A. What is the probability that at least one widget will be defective?
The way I set it up is using the formula: p(x) = nCx * p^x * q^nx
p= .9 q=.10 n=5 and x=0, cause P(X >= 1) = 1  P(X = 0)
= 1  5C0 * .90^0 * .10^50 = 1  1 * 1 * 0.00001 = 0.00001
I don't think this is right, please help.
Click here to see answer by Fombitz(25151) 
Question 850808: assume there is a 4 person family and you are looking at the gender of the children. let the random variable X stand for the number of females in the 4 children in the sample.
list the discrete random variable distribution in table format for this situation. find the mean,variance, and standard deviation for this distribution.
Click here to see answer by Fombitz(25151) 
Question 851028:
A biologist finds that 24% of fruit flies have short wings and 47% have eye defects. Assuming these two events are independent, what is the probability that a randomly selected fruit fly has neither short wings nor eye defects?
Click here to see answer by stanbon(69061) 

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