Questions on Algebra: Probability and statistics answered by real tutors!

Tutors Answer Your Questions about Probability-and-statistics (FREE)

Question 607945: Q. Ffind the mean, median, sum of the squared deviations, variance and standard deviation for 3.0, 3.4, 2.6, 3.3, 3.5, 3.2
I have a mean of 3.17, median of 3.25, sum of squared deviations 0.79, variance of 0.13 and standard deviation of 0.36. Am I right? I feel quite lost in statistics. Thanks in advace.
Click here to see answer by lynnlo(4155)

Question 607983: A random sample of size 2 is taken from the digits
3, 8, 10, 11
The range of each sample is calculated. What is the probability that the range is 1?
Click here to see answer by richard1234(5390)

Question 608031: hello, i need help on this ratio question:
In a class of 24 students the ratio of boys to girls is 3:5. How many girls are there?

my email is Bhopalaman@rocketmail.com
Click here to see answer by ewatrrr(10682)

Question 608016: hello, i need help on this ratio question:
18 pencils are shared in the ratio 4:5. How many pencils do each receive?

my email is Bhopalaman@rocketmail.com
Click here to see answer by scott8148(6628)

Question 608083:
A Math test has a mean of 43 and standard deviation of 17.0. Find the corresponding z scores for:

I. a test score of 13
II. a test score of 61

Click here to see answer by jim_thompson5910(28476)

Question 608085:

Starting with the data values 70 and 100, add three data values to the sample so that the mean is 90, the median is 94, and the mode is 94. Please show all of your work.

Click here to see answer by ewatrrr(10682)

Question 607540: 3.Determine whether the distribution below represents a probability distribution. If not, identify the requirement that is not satisfied.
X
1
2
3
4
5
p(x)
1.2
1.2
1.4
1.1
1.1
Click here to see answer by richard1234(5390)

Question 608156: when you add 24.25g and 12 g your answer rounded to the proper uncertainty would be
Click here to see answer by scott8148(6628)

Question 608257: A quart of parkers milk contains a mean of 39 grams of butterfat with a standard deviation of 2 grams. If the butterfat is normally distrubuted find the probability that the quart of this brand of milk chosen at random will contain A. 39-43 grams of butterfat of B. 36-39 grams of butterfat
Click here to see answer by stanbon(57226)

Question 607942: Normal Distribution
Average Starting salary $45,000
Standard Deviation $4,500
What is the probability of a new graduate receiving a salary between $45,000 and $50,000?
Click here to see answer by richard1234(5390)

Question 608271: A sample of six people in the neighborhood have taken up a collection of money, find the mean, median and mode of the sample. $500 $450 $325 $500 $250 $675
Click here to see answer by solver91311(16868)

Question 608322: Could you please help me with this question. It came from a study guide given in class. Thank you in advance!
Chapter Lesson: Confidence Intervals for the Mean, Small Samples (n<30)
6. Find the maximum error of estimate (E), and the small sample confidence interval for the population mean for the given values of c, x, σ, and n.
c = 95%
x = 162
σ = 10
n = 16
Click here to see answer by stanbon(57226)

Question 608421: Please help me with this problem.
Thank you.
A group of 5 children are each to choose one popsicle from a box of 12: 4 grape, 4 cherry, and 4 orange. What is the probability that each child will get the flavor they want?

Click here to see answer by richard1234(5390)

Question 608496: An 8 sided die, which may or may not be a fair die, has 4 colors on it; you have been tossing the die for an hour and have recorded the color rolled for each toss. Using relative frequency what is the probability you will roll a brown on your next toss of the die? orange brown green yellow 46 23 32 19

Click here to see answer by Edwin McCravy(8880)

Question 608572: you are dealt one card from a 52 card deck. Find the probability that you are dealt a king or a red card.
Click here to see answer by solver91311(16868)

Question 608659: For a particular sample of 80 scores on a psychology exam, the following results were obtained.
First quartile = 52 Third quartile = 78 Standard deviation = 7 Range = 45
Mean = 65 Median = 65 Mode = 76 Midrange = 62
Answer each of the following:
I. What score was earned by more students than any other score? Why?
II. What was the highest score earned on the exam?
III. What was the lowest score earned on the exam?
IV. According to Chebyshev's Theorem, how many students scored between 37 and 93?
V. Assume that the distribution is normal. Based on the Empirical Rule, how many students scored between 51 and 79?

Click here to see answer by Edwin McCravy(8880)

Question 608679: How many ways can you arrange the crayons in an eight-pack crayon box?
Click here to see answer by ewatrrr(10682)

Question 608542: construct or think of five situations where outcomes do not have equal chances

Click here to see answer by ankor@dixie-net.com(15628)

Question 608770: you wrote a computer program that generate two random numbers between 1 and 8. what is the probability that both values will be less than 4

Click here to see answer by stanbon(57226)

Question 608729: You are presented with three urns. Each urn has 10 marbles. In addition, each urn holds only black or red marbles. Urn 1 has 3 red marbles. Urn 2 has 8 red marbles. Urn 3 has 5 red marbles. You randomly pick 1 marble from 1 of the three urns. Calculate the probability that it is a black marble. Round answer to the nearest hundredth.

Click here to see answer by stanbon(57226)

Question 608717: what if a store is only accurate 80% of the time in getting everything right what is the probability that they will get the next 3 orders correct in a row
Click here to see answer by stanbon(57226)

Question 608794: Find the standard score (z) such that the area below the mean and below z is about 16% of the area under the normal curve.
Click here to see answer by stanbon(57226)

Question 608724: In a study, the sys5olic blood pressure for population of female participants are found to have a mean of 120 and a standard deviation of 12. Suppose the the blood pressure of a random sample of 64 female participants is obtained from this study. What is the probability that the sample mean is between 118 and 123?
Click here to see answer by stanbon(57226)

Question 608803: Find the probability of choosing either a spade or a face card (King, Queen, Jack) out of a standard
deck of cards.

Click here to see answer by Edwin McCravy(8880)

Question 608806: Find P (12 < x < 18); µ = 12, σ = 5
Click here to see answer by ewatrrr(10682)

Question 608808: ) Find P (0.45 < z < 2.1)

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Question 608805: What is the probability of getting exactly 6 heads in 10 coin tosses?

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Question 608805: What is the probability of getting exactly 6 heads in 10 coin tosses?

Click here to see answer by sunsetatdawn(4)

Question 608878: An ordinary (fair) die is a cube with the numbers 1 through 6 on the sides (represented by painted spots). Imagine that such a die is rolled twice in succession and that the face values of the two rolls are added together. This sum is recorded as the outcome of a single trial of a random experiment.
Compute the probability of each of the following events:
Event A: The sum is greater than 9 .
Event B: The sum is not divisible by 3 and not divisible by 4.
Write your answers as exact fractions.
Click here to see answer by solver91311(16868)

Question 608947: If the correlation coefficient is 0.930, what is the unexplained variation?
A) 7% B) 93% C) 13.5% D) 86.5%

Click here to see answer by stanbon(57226)

Question 609046: A box contains 12 red balls and 8 white balls. Two balls are drawn in succession. Find the following probabilities if the balls are drawn with replacement.
a.) A red ball is drawn then another red ball is drawn
b.) A red ball then a white ball
c.) Two white ball is drawn
d.) Both balls are of the same color
Click here to see answer by flame8855(424)

Question 609064: The probability of being selected is 3/17 what is the probability not being selected?
Click here to see answer by ewatrrr(10682)

Question 609334: teachers send 7 boys and 8 girls to the local science fair. the first 3 students leaving the fair at lunch time are interviewed find each probability.
a) all students interviewed are boys
Click here to see answer by flame8855(424)

Question 609459: the number of wins for each team in a league last year are listed. Make a frequency distribution for the data set
Click here to see answer by lynnlo(4155)

Question 609420: Find z-value of the following area for
A) 51.5% to the right of the total area
B) 45.2% to the right of the total area
C) 92% the middle of the total area
Please help immediately! I don't understand what my teacher is saying!
Click here to see answer by ewatrrr(10682)

Question 609496: the probability that a computer crashes during a week is 0.18. Room 12 has 6 computer in it. what is the probability that none of the computer crashes during the first week?
Click here to see answer by flame8855(424)

Question 609448: If 3 red-yellow tokens are flipped, what is the theoretical probability of all 3 tokens landing with the same color up?
Click here to see answer by flame8855(424)

Question 609521: Hi...I do my best in this Q and Try ..My email is toon_chy@yahoo.com.
A package of Smarties contains 8 red, 7 yellow, 5 green, 3 orange, and 2 brown goodies. A
little boy eats 7 of them at random. What is the probability that:
a. 3 are red
b. 3 are red, and 2 are yellow
c. At least 1 is orange
d. At least 1 is orange and 1 is brown
My answer..
a-if B (is the probability of 3 red)
P(B)=P(B/A)=3/7=O.4
b-if B (is the probability of 3 red)and C (is the probability of 2yellow)
P(B and C)=p(B).P(C)
P(B)=3/8=0.37 P(C)=2/7=0.28
P(B and C)=0.37*0.28=0.103
:.P(A and B and C)=p(A).P(B and C/P(A))=0.103
c- we used conditional and B is at lest 1 orange, P(A/B)=P(A and B)/P(B).
p(A and B)=P(A).P(B/A)= 0.28.((1/30)/0.28)=0.33
;. P(A/B)=0.33/(1/3)=0.1
d- I lost here
thx ...

Click here to see answer by ewatrrr(10682)

Question 609421: I think I have figured out this whole problem except for part D.
There are three boxes containing letters:
1: MATH
2: AND
3: HISTORY
A. From box 1, three letters are drawn one-by-one without replacement and recorded in order. What is the probability that the outcome is HAT?
(1/4)(1/3)(1/2) = 1/24
B. From box 1, three letters are drawn one-by-one with replacement and recorded in order. What is the probability that the outcome is HAT?
(1/4)(1/4)(1/4) = 1/64
C. One letter is drawn at random from box 1, then another from box 2, and then another from box 3, with the results recorded in order. What is the probability that the outcome is HAT?
(1/4)(1/3)(1/7) = 1/84
D. If a box is chosen at random and then a letter is drawn at random from the box, what is the probability that the outcome is A?
In box 1 the Probability is 1/4, In box 2 the probability is 1/3, and in box 3 the probability is 0. I don't know exactly how to combine these to get an answer? Please let me know if I'm even close to getting the answers correct in this whole problem. Thanks so much!
Click here to see answer by ewatrrr(10682)

Question 609564: Suppose in a competition 11 matches are to be played, each having one of 3 distinct outcomes as possibilities.?
The number of ways one can predict the outcomes of all 11 matches such that exactly 6 of the predictions turn out to be correct is
a) 11C6 * 2^5;
b) 11C6;
c) 3^6;
d) None of the above...
I think first option is correct assuming 3 outcomes but if we take two outcomes: right or wrong then option 2 also looks correct.

Click here to see answer by edjones(7569)

Question 609522: a box contains 7 white golf balls and 1 orange golf ball. what is the probability that a person will reach in without looking and get 2 white balls?
Click here to see answer by edjones(7569)

Question 609639: a set of data is normally distributed with a mean of 1000 and standard deviation of 100.
what would be the standard score for a score of 933?
what percentage of scores is between 1000 and 933?
what would be the percentile rank for a score of 933?

Click here to see answer by stanbon(57226)

Question 609647: How many five digit numbers can be formed if the leading digit cannot be zero and the number must be odd?
Click here to see answer by richwmiller(9135)

Question 609509: the probability that an RAC car is free to respond to an emergency is 0.8. Find the probability that, of two RAC cars on duty when an emergency call comes through
a- no car is available.
b- both cars are available.
c- just one car is available.
d- a car is available.
Click here to see answer by stanbon(57226)

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