5,395 Answered Questions for the topic probability

Probability Statistics

06/07/21

where is the critical region located?
A sample of 100 private school students were surveyed whether they planned to transfer to public schools in the incoming school year. Results showed that 40% of these students will transfer to... more
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06/07/21

In a one-tailed test, in which critical value listed below will the computed z of 2.313 fall in the acceptance region?
In a one-tailed test, in which critical value listed below will the computed z of 2.313 fall in the acceptance region?A. No answerB. 2.365C. 2.228D. 1.383E. 1.533
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Probability

06/06/21

The letters that form the word MATHEMATICS are placed in a bowl. Are the odds favorable or unfavorable that he will choose a letter that is a vowel followed by a “T”?

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Probability Statistics

06/06/21

You are a researcher studying the lifespan of a certain species of bacteria. A preliminary sample of 30 bacteria
You are a researcher studying the lifespan of a certain species of bacteria. A preliminary sample of 30 bacteria reveals a sample mean of ¯x=74x¯=74 hours with a standard deviation... more
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Probability Statistics

06/06/21

You measure 49 textbooks' weights, and find they have a mean weight of 65 ounces.

Assume the population standard deviation is 8.9 ounces. Based on this, construct a 99% confidence interval for the true population mean textbook weight.Give your answers as decimals, to two... more
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06/06/21

How do you calculate the confidence intervals for a population mean with only the sample mean and sample standard deviation?
I have a random sample and need to calculate the 95% confidence interval for the population mean(sample mean = 1076sample standard deviation = 80.61sample size is n=5)
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Probability

06/05/21

A class of 20 boys and 10 girls has 15 Math majors and 15 Physics students. What is the probability of picking a student who is both a boy and a physics major? A physics major and a girl?
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Probability Statistics

06/03/21

A) Show that f(x) is a p.d.f. B) Determine b. C) Find the mean of X.
The diameter of an electric cable, say X, is assumed to be continuous random variable with p.d.ff(x)=6x(1-x), 0 \< x \<1.A. Show that f(x) is a p.d.fB. Determine a number b such that... more
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Probability Statistics

06/03/21

Find the probability.
A survey claims that 73% of Australia households have at least one credit card. Find the probability that in a random sample of 550 Australia households, 375 to 385 have at least one credit card.
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Probability Statistics

06/03/21

Find the standard deviation.
The average age of a breed of dog is 19.5 years. If the distribution of their ages is normal and 20% of dogs are older than 22.6 years, find the standard deviation.
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Probability Statistics

06/03/21

If 18 car owners are randomly selected, find the probability that at most two people have their cars washed professionally.
A study found that 28% of car owners in America had their cars washed professionally rather than do it themselves. If 18 car owners are randomly selected, find the probability that at most two... more
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Probability Statistics

06/03/21

What is the probability that 10 of the 12 hens will lay eggs on a given day?
The probability that a mature hen will lay an egg on a given day is 0.80. Hannah has 12 hens. What is the probability that 10 of the 12 hens will lay eggs on a given day?
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Probability Statistics Mathematics

06/03/21

Help me solve this statistics question.
A drinks machine dispenses coffee into cups. A sign on the machine indicates that each cup contains 50 ml of coffee. The machine actually dispenses a mean amount of 55 ml per cup and 10% of the cup... more
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06/03/21

Hi can someone please help with this, by using the formula of z-scores and z-scores table. Thank you so much!
If the systolic blood pressure of obese people has a mean of 132 and standard deviation of 8, find the probability that a person have the following blood pressure. Assume the variable is normally... more
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Probability Math Mathematics Stem

06/02/21

Hi can someone please help with this, by using the formula the z-scores and z-scores table
The average age of the company's president is 56 years old. Assume the variable is normally distributed is four years, find the probability that the age of a president will be between 52 and 58.
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Probability

06/02/21

probability and stastics
A test for a certain disease is found to be 95% accurate, meaning that it will correctly diagnose the disease in 95 out of 100 people who have the ailment. For a certain segment of the... more
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Probability Statistics

06/02/21

What is the standard deviation of the distribution?
This equation comes from Edgenuity's course of Statistics, and I am taking the course as a high school senior. I understand how to find the standard deviation.Standardized tests for certain... more
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Probability Statistics

06/02/21

What is the probability that 83% or more of this sample…?
This equation comes from Edgenuity's course of Statistics, and I am taking the course as a high school senior. I understand how to find the z-score and, in this case, not the standard deviation.A... more
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Probability

06/02/21

Probability and Statistics

The systolic blood pressure of adults in the USA is nearly normally distributed with a mean of 121 and standard deviation of 17 .Someone qualifies as having Stage 2 high blood pressure if their... more
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Probability Algebra 2

06/01/21

Algebra 2 Probability

It is estimated that 4% of people will get strep throat. Of the people with strep throat, the test for infection will give a positive reading 97% of the time. Given someone does not have strep... more
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Probability Math

05/31/21

How many different ways can the members of the Defense Subcommittee be chosen from among the 29 senators on the Appropriations Committee?
The US Senate Appropriations Committee consists of 29 members—15 Republicans and 14 Democrats. The Defense Subcommittee consists of 19 members—10 Republicans and 9 Democrats. How many different... more
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Probability

05/30/21

Please help me this probability question
A grocery store is sponsoring a sale promotion where the cashier give away one of letters A, E ,L,S ,U ,V for each purchase. If a customer collects all six letters he gets 10 dolar worth for... more
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05/30/21

For a Geometric distribution with parameter p = 1/3 ,then the mean and variance are given by
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05/30/21

If a random variable X follows exponential distribution with parameter λ = 2 ,then its probability density function is given by
choose the correct answera. f (x)  2e2x , x  0 b. f (x)  12 e 12 x , x  0 c. f (x)  2e2x , x  0 d. f (x)  12 e 12 x , x  0
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Probability Statistics

05/28/21

A coach has 36 seats. 85% of people show up for their journey. You have been hired by a coach company to recommend how many tickets they sell.

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