Tutors Answer Your Questions about Probabilityandstatistics (FREE)
Question 431548: A threedigit number is chosen by randomly picking from the digits 1 through 9, and no digit can be chosen more than once. If the first two choices picked are the digits 2 and 8, what is the approximate probability that the third digit will be even?
Click here to see answer by sudhanshu_kmr(1152) 
Question 431630: Drawing Colored Marbles from Boxes. A bag contains fifty blue and fifty green marbles. Two marbles at a time are randomly selected. If both are green, they are placed in box A; if both are blue, in box B; if one is green and the other is blue, in box C. After all marbles are drawn, what is the probability that the numbers of marbles in box A and box B are the same?
Click here to see answer by scott8148(6628) 
Question 431995: can anyone help me with this please? Im new to statistics
Among the group of 20 students who registered for the statistic course, 8 of them are firstyear students. 5 students are randomly selected from the group. What is the probability that exactly 2 of the selected students are firstyear students?
thank you!
Click here to see answer by ewatrrr(22107) 
Question 432269: Can anyone help please I have no clue on how to do this stuff "You roll three differentcolored dice and use the numbers on the dice to determine the lengths of the sides of a triangle. What is the probability of building a right triangle?" Please help me have no clue how to do this Thank You
Click here to see answer by stanbon(69061) 
Question 432497: Need some help with this problem... Thank you for your time and consideration
1. If a single letter is drawn from the set{m,a,t,h} what
is the probability that the letter drawn is a member of
the set {m, a, t, h, e, i, c, s}?
Click here to see answer by edjones(8007) 
Question 432504: Need help with this problem, thank you for your time and consideration.
21. Each capital letter of the alphabet is carefully printed on a piece of paper in blockletter form and placed in a bowl.
A B C D E F G H I J K L M
N O P Q R S T U V W X Y Z
An individual piece of paper is selected from the bowl.
What is the probability that
a. the letter is a consonant?
b. the letter is formed from straightline segments only?
c. the letter has an enclosed region in its representation?
Click here to see answer by rwm(914) 
Question 432503: Need help with this problem, thank you for your time and consideration.
Consider the experiment of selecting a card from
an ordinary deck of 52 playing cards and determine the probability
of the stated event.
11. a. A nonface card or a 7 is drawn.
b. A card that is not a king and not a spade is drawn.
Click here to see answer by ewatrrr(22107) 
Question 432249: Hi,
I was wondering if you could help me solve this probability question and check if my answers are correct.
Question: Adam bought a package of marbles and sorted all of them by color as shown in the accompaning graph.
a) What is the total number of marbles in the package?
* 12marbles
b) If one marble is selected at random, find the probability that it is red, black, or yellow.
* 8/12 marbles
c) If two marbles were selected at random, with replacement, find the probability that
1) the first marble was red and the second was yellow.
* 3/12 marbles
2) one of the two marbles was blue
* 0/12
d) If two marbles were selected at random, without replacement, find the probability that
1) two red marbles were selected
*3/23
2) neither marble selected was red or black
*9/12
Amount of Marbles
Red: 2
White: 4
black: 1
yellow: 5
( there were no blue marbles in the bar grapg)
Thanks for all your help. It is greatly appreciated.
Click here to see answer by sudhanshu_kmr(1152) 
Question 432547: I need someone to help me with this difficult homework problem:
There are eight envelopes, one of them contains a $100 bill and the others are empty. You randomly pick one envelope and open it. If it doesn’t have $100 in it, you discard the envelope and pick another envelope. This continues until you pick the envelope that contains $100. Find the probability that the 5th envelope you pick contains the $100 bill. Answer in fraction.
Click here to see answer by sudhanshu_kmr(1152) 
Question 432592: A local fastfood restaurant has determined that 10% of drivethru orders are filled incorrectly. Suppose 5 orders are randomly selected. what is the probability that more than one of the orders is filled incorrectly?
Click here to see answer by edjones(8007) 
Question 432698: Need Help With This Problem... Thank You!!
3. How many threesymbol codes (letterletternumber)
can be made from the letters S, P, Y, and one digit from
the set {0,1,2,....,9} without repetition?
Click here to see answer by liz36(1) 
Question 432703: Need Help With This Problem... Thank You!!
11. Three cards are drawn without replacement from an
ordinary deck of 52 playing cards. What is the probability
that the third card is a spade if the first two cards
were not spades?
Click here to see answer by edjones(8007) 
Question 432701: Need Help With This Problem... Thank You!!
9. Two cards are drawn without replacement from an ordinary deck of 52 playing cards. What is the probability that both cards are kings if the first card drawn was a king?
Click here to see answer by josmiceli(13716) 
Question 432702: Before electronics took over, slot machines were like this: you pull the lever to spin three wheels; each wheel has 20 symbols, all equally likely to show when the wheel stops spinning; the three wheels are independent of each other. Suppose that the middle wheel has 9 cherries among its 20 symbols, and the left and right wheels have 1 cherry each.
a.) You win the jackpot if all three wheels show cherries. What is the probability of winning the jackpot?
b.)There are three ways that the three wheels can show two cherries and one symbol other than a cherry. Find the probability of each of these ways.
c.) What is the probability that the wheels stop with exactly two cherries showing among them?
Click here to see answer by edjones(8007) 
Question 432712: Need Help With This Problem... Thank You!!
27. A parent’s chance of passing a rare inherited disease on to a child is 0.15. What is the probability that, in a family of three children, none of the children inherits the disease from the parent?
Click here to see answer by edjones(8007) 
Question 432710: Need help with this Problem... Thank You!!
23. At a quality control checkpoint on a manufacturing
assembly line, 10% of the items failed check A, 12%
failed check B, and 3% failed both checks A and B.
a. If a product failed check A, what is the probability
that it also failed check B?
b. If a product failed check B, what is the probability
that it also failed check A?
c. What is the probability that a product failed either
check A or check B?
d. What is the probability that a product failed neither
check A nor check B?
Click here to see answer by edjones(8007) 

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