College random variables problems, solved and explained

The probability of an event to happen in the next week is p and It is constant throughout the week What is the probability of this event to happen in the next 2 days?

2022-04-15

The probability of an event to happen in the next week is p and It is constant throughout the week What is the probability of this event to happen in the next 2 days?

Sara Faghani 2022-03-25

Dottie’s Tax Service specializes in federal tax returns for professional clients, such as physicians, dentists, accountants, and lawyers. A recent audit by the IRS of the returns she prepared indicated that an error was made on 7 percent of the returns she prepared last year. Assuming this rate continues into this year and she prepares 80 returns, what is the probability that she makes errors on: a. More than six returns? b. At least six returns? c. Exactly six returns?

2022-03-25 Answered

Assume a binomial probability distribution with n = 50 and p =0.25. Compute the following: a. The mean and standard deviation of the random variable. b. The probability that X is 15 or more. c. The probability that X is 10 or less.

2022-03-21

2022-03-20

2022-03-15 Answered

If 16 customers on average stop by Dunkin' Donuts per hour. Then what is the probability that 5 customers will stop by in half an hour? * Pick the nearest number to your answer.a.065b. 0.0916c. .05d. 0.5

maryjanebwalya 2022-03-13 Answered

If the joint probability density function of two continuous random variables X and Y isgiven by f(x; y) = 2, 0 < y < 3x, 0 < x < 1;find,(a) f(y/x), (3)(b) E(Y/x), (2)(c) Var(Y/x).

2022-03-08 Answered

If the joint probability density function of two continuous random variables X and Y isgiven by f(x; y) = 2, 0 < y < 3x, 0 < x < 1;find,(a) f(y/x),(b) E(Y/x), (c) Var(Y/x).

2022-03-06

Find the density of random vairable Z=X+Y, whare X and Y two independent uniform random vairableS over (-1, 1)?

xvyder1999 2022-03-02

Suppose that the height, in inches, of a 20-year-old man is a normal random variable
with parameters μ = 175 and σ = 10.
There are ten 20-year-old men in the class. What's the probability that more than 8
of them are over 185cm?

2022-03-01 Answered

Suppose that the height, in inches, of a 20-year-old man is a normal random variable
with parameters μ = 175 and σ = 10.
There are ten 20-year-old men in the class. What's the probability that more than 8
of them are over 185cm?

2022-02-12 Answered

2–6. Resolve F2 Into Components Along The U And V Axes, And Determine The Magnitudes Of These Components. F2 = 150 N V 30° 30° 45° F1 = 200 N

Randy Dean 2022-02-11 Answered

I need to figure out how or where to find the standard deviation and mean for this problem Given that z is a standard normal random variable, compute the following probabilities.
a. P(z≤−1.0)
b. P(z≥−1)
c. P(z≥−1.5)
d. P(−2.5≤z)
e. P(−3

Addison Gross 2022-01-30 Answered

What are the mean and standard deviation of a probability density function given by $P r (X = k) = \frac{12^{k} e^{- 12}}{k!}$ for $k \in {0, 1, 2. . . \infty}$ ?

Alex Cervantes 2022-01-30 Answered

A distribution has a mean of 10400.93 and a standard deviation of 5112.49. What is one standard deviation below the mean?

Adrian Cervantes 2022-01-30 Answered

What are the mean and standard deviation of a probability density function given by $P r (X = k) = \frac{24^{k} e^{- 24}}{k!}$ for $k \in {0, 1, 2. . . \infty}$ ?

segnverd3a 2022-01-30 Answered

What are the mean and standard deviation of a probability density function given by $P r (X = k) = \frac{9^{k} e^{- 9}}{k!}$ for $k \in {0, 1, 2. . . \infty}$ ?

Emmy Combs 2022-01-30 Answered

What are the mean and standard deviation of a probability density function given by $P r (X = k) = \frac{14^{k} e^{- 14}}{k!}$ for $k \in {0, 1, 2. . . \infty}$ ?

GrareeCowui 2022-01-30 Answered

What does a small standard deviation signify? What does a large standard deviation signify?

When you have an equation that deals with random variables, always start with an explanation related to some random variable examples. It is what the majority of skilled engineers do because it is the only way how one can avoid mistakes when working with statistical data. Even though this part of statistics and probability may seem overly complex, approach every random variable equation through the lens of probability as you seek answers to your questions. Compare provided solutions, see similarities, and you will achieve the most efficient solutions.

Random Variables Questions & Answers