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Probability distributions
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Questions (281)
if np >5 and nq>5 estimate P (fewer than 4) with n=13 p=0.4 by using normal distribution as an approximate to the binomial
1 answer
asked by
andrea
1,281 views
Suppose we want to model the number of rats captured in a single trap in a day, where the average
number caught is 5 (i.e. X ∼
1 answer
asked by
Janet
371 views
For X ∼ Poi(λ), show that E(X) = λ and V ar(X) = λ. (Hint: Find E[X(X − 1)] = E(X2
) − E(X).)
1 answer
asked by
Becca
486 views
For X ∼ Bin(n, p), show that E(X) = np and Var(X) = np(1 − p)
Our book defines this as true, but I don't know how to actually
1 answer
asked by
Janet
406 views
The Geometric distribution is used when we want to find the probability of performing a sequence of
trials with X “failures”
1 answer
asked by
Becca
500 views
The number of arrivals per period is distributed according to the Poisson with an expected value of 0.75 unit per period. The
2 answers
asked by
Joseph
478 views
I roll a pair of fair dice and compute the number of spots on the two sides facing up. Denote this total by X. The probability
3 answers
asked by
MT
1,522 views
A trucking firm delivers appliances for a large retail operation. The packages (or crates) have a mean weight of 306 lb. and a
1 answer
asked by
Gayle 79
410 views
What is the distribution followed by Y1,...,Yn in this scenario, where Yi = 1 if Xi ≤ 0.5?
Hint: The possible answer choices
1 answer
asked by
Jjjjj
242 views
Question Part
Points Submissions Used The number of ships to arrive at a harbor on any given day is a random variable represented
1 answer
asked by
kim
430 views
A random variable X has a Gamma distribution with (alpha = a, beta = b). Show that P(X > 2ab) < (2/e)^a.
hint: X > c is
3 answers
asked by
Allie
425 views
A chairman is biased so that he selects his relatives for a job 3 times as likely as others. If there are 3 posts for a job.
2 answers
asked by
anoynomous
601 views
A chairman is biased so that he selects his relatives for a job 3 times as likely as others. If
there are 3 posts for a job. Find
1 answer
asked by
anoynomous
857 views
1. Suppose that the mean of the annual return for common stocks from 1950 to 2012 was 9.4%, and the standard deviation of the
1 answer
asked by
Michelle
410 views
the head circumferences of adult males have a bell-shaped distribution with the mean= 65cm and standard deviation =2cm.
a. what
1 answer
asked by
jenny
866 views
What is the difference between a skewed distribution and a normal distribution?
1 answer
asked by
Marie
434 views
Consider a normal population with μ = 36 and σ = 4.9. Calculate the z-score for an x of 47.6 from a sample of size 14. (Give
4 answers
asked by
samantha
372 views
Verify that the expression formula for a hypergeometric distribution gives the same result as the general equation for the
1 answer
asked by
Joshua
383 views
A factory’s worker productivity is normally distributed. One worker (worker 1) produces an average of 75 units per day with a
2 answers
asked by
SB
870 views
Two dice are rolled. Let the random variable X denote the number that falls uppermost on the first die and let Y denote the
1 answer
asked by
Price
889 views
1. In a City, out of 20000 news paper subscribers, exactly 5000 subscribe to The Hindu. An advertising firm surveys 500
2 answers
asked by
Arun
894 views
When would you use Chebyshev’s theorem and the empirical rule in health administration? How are they calculated? Provide one
1 answer
asked by
tara
360 views
IF arithmetic mean is 10 and V(X)=4
find mean and standard deviation of z where Z=5x+4
1 answer
asked by
Anonymous
258 views
Which of the following would be closest to a normal distribution?
a.) The sampling distribution of the average weight of 40 eggs
2 answers
asked by
Manda
835 views
Find the mean and standard deviation of the following probability distribution:
x 1 2 3 P(x) 0.3 0.5 0.2
1 answer
asked by
Jen
366 views
How many green elements are required to make this a legitimate probability distribution if there are a total of 50 elements in
1 answer
asked by
Jennifer
421 views
How many green elements are required to make this a legitimate probability distribution if there are a total of 50 elements in
1 answer
asked by
Jennifer
817 views
rent-4-wheels makes a profit of $12 per day for each car rented, and loses $4 per day for each car that is not rented. How many
1 answer
asked by
Stephanie
422 views
I. Use Chebyshev’s theorem to find what percent of the values will fall between 183 and 227 for a data set with a mean of 205
5 answers
asked by
Jennifer
594 views
Consider an RV X with the following density given parameters α and γ .
f (x) = {(1/γ)e^(-(x-α)/γ) if x>α {0 if x ≤ α. a.
1 answer
asked by
Molly
1,118 views
A telemarketer with B2B Communications has a 20 percent historical probability of making a sale during a shift where 100 calls
2 answers
asked by
tom
489 views
Can discrete data be analyzed using a normal distribution?
1 answer
asked by
Anonymous
306 views
Discuss how the Empirical Rule works
1 answer
asked by
Anonymous
371 views
John parks cars at a hotel. On the average, 6.0 cars will arrive in an hour. A driver's decision on whether to let John park the
1 answer
asked by
Mich Mich
986 views
Doing this assignment and was wondering if i got the right answers
According to the Census Bureau publication Current Population
3 answers
asked by
Ryan
613 views
suppose the number of customer complaints per day on the morning shift (6am-12) at Murph's Coffee is distributed as follows:
Comp
1 answer
asked by
Sam
1,088 views
Find the mean and standard deviation for a binomial distribution with these values:
a. n = 1000, p = 0.3 b. n = 400, p = 0.01 c.
1 answer
asked by
Anonymous
405 views
X f(x)
0 .25 1 .20 2 .15 3 .30 4 .10 Is it prpbsbility distribution valid? Explain and list the requirement for a valid
1 answer
asked by
Laverne
395 views
Regardless of the values specified for the parameters μ (mean) and σ (standard deviation), the shape of the Normal density
3 answers
asked anonymously
29 views
A loaf of bread is normally distributed with a mean of 22 ounces and a standard deviation of .5 ounces.
What is the probability
2 answers
asked by
Anonymous
578 views
If the life in years, of a television set is normally distributed with a mean of 46 years and a standard deviation of 4 years,
4 answers
asked by
Maria
762 views
The number of accidents that occur at the intersection
of Pine and Linden streets between 3 p.m. and 6 p.m. on Friday afternoons
1 answer
asked by
jason
375 views
For the multinomial distribution:
Show that summation of the probability mass function across all possible values equals 1. Show
1 answer
asked by
Sean
314 views
Remeber that it is areas under a density curve, not the height of the curve, that give proportions in a distribuiton. To
1 answer
asked by
Stat
434 views
The number of accidents that occur at the intersection of Pine and Linden streets between 3 p.m. and 6 p.m. on Friday afternoons
3 answers
asked by
Twg
451 views
Decide which of the variables described is likely to have a normal or near-normal distribution.
a. The number of courses
7 answers
asked by
George
660 views
The First American bank is trying to determine whether it should install one or two drive-through windows. The following
1 answer
asked by
mervat
478 views
A) Choose one of the following distributions (positively skewed normal distribution, negatively skewed normal distribution or
1 answer
asked by
Lauren
736 views
As a sample size approaches infinity, how does the student’s t distribution compare to the normal z distribution?
1 answer
asked by
Marilyn
392 views
The lifetime of a particular type of battery is normally distributed with a mean of 1100 days
and a standard deviation of 80
2 answers
asked by
Dherain
858 views
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Parent Categories (16)
Apple picking probability
Continuous Random Variables
Data Analysis
Expected Value
Expected Value and Variance
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