803 Answered Questions for the topic Probability & Statistics

Probability & Statistics

02/23/16

Probability questions
The sales force of business consists of 10 men and 10 women. A production unit of 5 people is set up at random.a) what is the probability that it will consist of 2 men and 3 women?b) what is the... more
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Probability & Statistics

02/23/16

he mean number of hours a team of doctors take on an individual operation is 3.1 hours. Assuming the standard deviation is 0.5 hours.
The mean number of hours a team of doctors take on an individual operation is 3.1 hours.Assuming the standard deviation is 0.5 hours. Find probability that any team of doctorswill spend less than... more
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Probability & Statistics

02/22/16

In one town, 45% of all voters are Democratic if two voters are randomly selected for a survey, find the probability that both are Democrats.
Im not sure how to put this into an equation. I do not know which rule to utilize. 
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Probability & Statistics Statistics/probabilitg

02/22/16

statistics and probability question.
in a batch of 8,000 clock radios 6% are defective. a sample of 5 clock radios is randomly selected without replacement from the 8,000 and tested. the entire batch will be rejected if at least one... more
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Probability & Statistics

02/21/16

probability and statistics
You toss independently a fair coin and you count the number of tosses until the first tail appears. If this number is n, you receive 2n dollars. What is the expected amount that you will receive?... more
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Probability & Statistics

02/18/16

A pair of 6 sided dice are tossed. What is the probability that at least one of the dice has a value greater than or equal to 4?
We are working on probability in statistics right now and I can't seem to get the right answer on our homework for this question. 
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Probability & Statistics

02/10/16

sample distribution
Given X follows a N(mean= 40, standard deviation= 36) distribution, find the value of x that has 0.45 ofthe area to the left. That is, find P(X less than or = x) = 0.45 Thanks in advance for your... more
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Probability & Statistics

02/10/16

Probability of 6 yellow and 3 reds balls
Suppose we have a box that contains 6 yellow and 3 red balls. Suppose we draw 2balls with replacement from the box.   1. What is the probability that we draw 0 yellow balls?2. What is the... more
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Probability & Statistics

02/08/16

if 3 specific persons among 6 insist to be lined up , how many ways are possible
related to probability
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Probability & Statistics Math Statistics Question Math Word Problem

02/02/16

Probability and Statistics Question
There are 45 green and 55 red Christmas ornaments in a box that you cannot see into. Imagine that you have to choose an ornament and then place it back into the box.a) What is the probability of... more
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Probability & Statistics

01/31/16

P(172 < x <192)
the random variable x is normally  distributed  with  mean  u = 174 and standard  deviation = 20. Find the indicated probability.            P(172 < x <192)
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Probability & Statistics

01/31/16

Probabilities
Heights of Women   In a survey of U.S. women, the heights in the 20 –29 age group were normally distributed, with a mean of 64.2 inches and a standard deviation  of  2.9  inches.  Find  the... more
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Probability & Statistics

01/31/16

Probabilities
ACT Math Scores   In a recent year, the ACT  scores for the math portion of the test were normally distributed, with a mean of 21.1 and a standard deviation of 5.3. Find the probability that a... more
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Probability & Statistics

01/31/16

Probabilities
The amounts of time per workout an athlete uses a stairclimber are normally distributed, with a mean of 20 minutes and a standard deviation of 5 minutes. Find the probability that a randomly... more
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Probability & Statistics

01/30/16

given that the set k = {a,b,c,d,e,f}
given that the set k = {a,b,c,d,e,f} How many subsets of K contain exactly 4 elements? How many subsets of K contain at least 5 elements?
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Probability & Statistics

01/30/16

Carter is collecting data on the number of giraffes in Africa over time.
Carter has created a scatter plot that shows the relationship between the number of giraffes g and time x. She thinks the data might show that g is a quadratic function of x. Which graph will... more
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Probability & Statistics

01/26/16

Probability
Professor Jackson is in charge of a program to prepare students for high school equivalency exam. Records show that, in the program, 80% of the students need work in math, 70% need work in English,... more
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Probability & Statistics

01/26/16

how to calculate subsets using a certain number of elements
Given that the set ?? = {??, ??, ??, ??, ??, ??}: a) How many subsets of K contain exactly 4 elements?b) How many subsets of K contain at least 5 elements?
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Probability & Statistics

01/25/16

Out of 36 random drawings what are the odds of numbers 1-12 each coming up 3 times?
If you had 12 possible outcomes what are the odds that each outcome would come up exactly 3 times out of 36 drawings?So I'm going to make a random drawing 36 times and the outcome can be numbers... more
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Probability & Statistics Probability Probability Problems

01/21/16

Help determining chances of winning in a modified game of roulette
Hey all. Wondering if you can help me out with the chances of winning in a round of N spins in a modified game of rouletteTHE GAME15 numbers, red/black and green0 : GREEN1-7 : RED8-14 :... more
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Probability & Statistics

01/14/16

Raffle Question. See Description.
There is a raffle that involves 18 tickets. The tickets are numbered and you can select any numbered ticket you please. You decide to buy 8 tickets. Now what is the best way to decide which numbers... more
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Probability & Statistics

01/14/16

Probability of all five men winning
among the contestants in a competitio 49 are woman and 29 men.if five winners are randomly selecte, what is the probability they are all men? 
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Probability & Statistics

01/13/16

You are delt two cards from a deck of 52 find the probability that both cards are black assume 26 black cards in the deck
I am having trouble with probablity problems, other ones with percentages and such please help
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Probability & Statistics Statistics

01/10/16

Which question do you think brought more support?
Question 1: Like Dave Barry, people generally want to appear knowledgeable and agreeable, and they want to present a favorable face to the world. How might that affect the results of a survey... more
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Probability & Statistics Statistics

01/10/16

Find the Probability?
In Hi-tense City, 35% of adults have high blood pressure or high cholesterol. One out of every four people has high blood pressure, and one out of every five has high cholesterol.Find the... more
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