744 Answered Questions for the topic Probability & Statistics

Probability & Statistics

12/01/15

What is the probability that a total of two dice thrown will be higher than a 4 given that the first dice is a 1?
 Remember to denote event A and event B, think about whether these will be dependent or independent? Use the corresponding formula in order to get to the answer.
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Probability & Statistics

12/01/15

Equipment A produces 12% and B produces 88% of spare parts.
From the past, the company knows that the probability of equipment A to produce a defective spare part is 0.03 and the probability for equipment B to produce a defective spare part is 0.07. If a... more
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Probability & Statistics Probability Story Problems Matrix

11/30/15

Probability and Markov Processes? Free Throws. Please Help.
If she made the last free throw, then her probability of making the next one is 0.9. On the other hand, If she missed the last free throw, then her probability of making the next one is 0.2. Assume... more
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Probability & Statistics Math Probability Ncr

11/29/15

The answer is 4/143 but I cannot figure out how to set my problem up to get to that answer. We are using nCr on the calculator to figure out our equation
A doctor has five doses of flu protection vaccine left. he has six women and eight men who want the medication. if the names of five of these people are selected at random determine the probability... more
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Probability & Statistics

11/28/15

Statistics
In a survey of adults 68% thought DNA tests for identifying an individual were very reliable. If you randomly select 44 adults and ask ear if he thinks the DNA tests for identifying an individual... more
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Probability & Statistics

11/25/15

Properly calculate an x times increase in probablity
Sample problem: Out of 100 events an outcome probablity is 0%. If the probability of this outcome increases by 21 times, what is the new probability %? Please share the calculation. Help is much... more
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Probability & Statistics

11/23/15

SB 7.35 fair method
35. Every year, the NBA holds a draft lottery. Teams who miss the playoffs in any given year are put into the lottery the next year. The team with the worst record gets 250 table tennis balls in... more
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Probability & Statistics

11/23/15

SB 7.31 probability
31. Find the probability of rolling a three first and then a four when a die is rolled twice.   a) 1/18 b) 1/6 c) 1/12 d) 1/36  
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Probability & Statistics

11/23/15

SB 7.19 normal distribution
19. Which of the following data sets could most likely be normally distributed?   a) Number of homeruns per baseball player in a championship seriesb) IQ test scoresc) Yearly income for... more
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Probability & Statistics

11/22/15

Standard Normal Distribution
separates the middle 95% of the data.
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Probability & Statistics

11/22/15

Finding the z-score for the middle 72% of the data
That separate the middle 72% of the data.
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Probability & Statistics

11/21/15

SB 7.15 accurate interpretation
15. Jimmy finds that the probability of rolling a die and getting a number that is three or less or is odd is 4/?=2/6≈67%. Which of the following is an accurate interpretation of this... more
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Probability & Statistics

11/21/15

SB 7.14 - probability
14. Find the probability of drawing a heart or a face card from a standard deck of cards.   a) 25/52 b) 6/26 c) 1/4 d) 11/26
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Probability & Statistics

11/21/15

SB 7.12 probability
12. Find the probability of rolling a prime number when a die is rolled.   a) 1/2 b) 1/3 c) 0 d) 1/6
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Probability & Statistics

11/21/15

SB 7.11 - probability
11. Shally decides to do an experiment to see how many times her MP3 player will shuffle through her songs and play her favorite group, “The Googly Girls” per hour. Her results are shown in the... more
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Probability & Statistics

11/19/15

SB 7.5 probability of marbles
5. Find the probability of selecting a green marble from a jar that contains 4 blue marbles, 3 red marbles, and 5 green marbles.   a. 1/3 b. 1/4 c. 5/12 d. 1/5
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Probability & Statistics

11/19/15

SB 7.4 probability w/o replacement
4. Find the probability of drawing an ace and a jack when two cards are drawn (without replacement) from a standard deck of cards.   a. 16/2607 b. 4/663 c. 1/221 d. 1/169  
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Probability & Statistics

11/19/15

SB 7.3 population standard deviation
3. What is the population standard deviation of the data set 6, 22, 18, 12, 15, 25?   a. 6.89 b. 16.5 c. 16.33 d. 6.29
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Probability & Statistics

11/19/15

SB 7.2 odds in favor
2. Find the odds in favor of rolling the same number on each of a pair of dice.   a. 1 to 6 b. 1 to 5 c. 2 to 5 d. 3 to 10
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Probability & Statistics

11/19/15

SB 7.1 - population mean
1. Weston asked 20 of his friends, ‘Are you going skiing this weekend?” Eight of the 20 said yes, they are going skiing. What would be the best estimate for the population mean?   a. 0.4 b.... more
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Probability & Statistics Math Probability Word Problem

11/18/15

markov chains
(i) If volume is high this week, then next week it will be high with a probability of 0.9 and low with a probability of 0.1. (ii) If volume is low this week then it will be high next week with a... more
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Probability & Statistics Math Probability Word Problem

11/18/15

markov chains
If the animal is in the woods on one observation, then it is three times as likely to be in the woods as the meadows on the next observation. If the animal is in the meadows on one observation,... more
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Probability & Statistics Math Statistics Statistics Question

11/17/15

Find a 90% confidence interval for the population average startup costs µ for candy store franchises
Do you want to own your own candy store? Wow! With some interest in running your own business and a decent credit rating, you can probably get a bank loan on startup costs for franchises such as... more
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Probability & Statistics Math Statistics Statistics Question

11/17/15

Compute 95% and 99% confidence intervals for µ using Method 1 with a Student's t distribution!
When σ is unknown and the sample is of size n ≥ 30, there are two methods for computing confidence intervals for μ. Method 1: Use the Student's t distribution with d.f. = n − 1. This is the... more
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Probability & Statistics Math Statistics Statistics Question

11/17/15

A farm brings 15 tons of watermelon to market. Find a 90% confidence interval for the population mean cash value of this crop. What is the margin of error? Hint
What price do farmers get for their watermelon crops? In the third week of July, a random sample of 38 farming regions gave a sample mean of x = $6.88 per 100 pounds of watermelon. Assume that σ is... more
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