760 Answered Questions for the topic Probability & Statistics

Probability & Statistics Probability Math Help Conditional Probability

03/23/16

Conditional Probability & The Multiplication Rule Help!
A card is drawn at random from a deck. What's the probability that it is a jack given that it is a face card?
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Probability & Statistics

03/22/16

Vos savant math problem
Vos savant math problem, why would choosing to switch from door 1 to door 2 be better? In that specific scenario wouldnt it be 50/50 because of the host reveals a goat in door 3 then that means the... more
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Probability & Statistics Probability Probability Problems

03/21/16

Probability statistics and two tailed test
A tomato farmer with a very large farm of approximately 2200 acres had heard about a new type of rather expensive fertilizer which would supposedly significantly increase his production. The frugal... more
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Probability & Statistics Standard Deviation

03/20/16

standard deviation find the probability that more than 30%
A manufacturer produces a certain type of components that has a length of 2.1 cm. the distribution of this components is normal with mean 2.15 cm and sd 0.4cm. There are 50 pieces in a bag. Find... more
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Probability & Statistics Statistics Probability Math Help

03/20/16

Math Homework Help!! Permutations, Combinations,Counting Techniques
There are 10 puppies. 6 are male, 4 are female. If you pick 3 puppies at random, what is the probability they will all be the same gender?
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Probability & Statistics

03/16/16

.His class had 30 students.To save time,he asked 10 boys the brand of sneakers that they were wearing..This was NOT a random sample.STATE ONE REASON WHY
write in a coplete sentence  
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Probability & Statistics

03/14/16

What is the number of possible outcomes if three quarters are tossed and the total numbers of heads and tails are counted?
A) 2 B) 4 C) 6 D) 8
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Probability & Statistics

03/14/16

If the probability of rain on any given day is .2 what is the probability that it will rain 2 days in a week?
If the probability of rain on any given day is .2 what is the probability that it will rain 2 days in a week?
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Probability & Statistics

03/07/16

Suppose you tossed a die six times. What is the probability of getting exactly three fours
Probability 
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Probability & Statistics Probability

03/04/16

probability question
Probability of stopping at first traffic light is 0.7 and the probability of stopping at 2nd traffic light is 0.4. what is the probability of stopping at a)both light b) none of the traffic light   more
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Probability & Statistics

03/03/16

You roll two six sided dice. What is the probability that you will roll an even the first time and a 5 on the second roll?
 You roll two six sided dice.  What is the probability that you will roll an even the first time and a 5 on the second roll?
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Probability & Statistics

03/01/16

Figuring out which payment plan is the best and why
you have been paying a delivery service $6 per week to make regular deliveries to your house. One week, just to make things interesting, you offer the service a new payment plan. Each week, you... more
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Probability & Statistics Statistics Statistics Question

02/24/16

Statistics Question: Cholesterol levels are normally distributed with a mean of 170 and a SD of 30.
Find the probability a randomly selected individual has a cholesterol level greater than 225.    The answer is = 0.0336 But i am not sure how to find this answer. 
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Probability & Statistics Statistics Statistics Question

02/24/16

Statistics Question: (1) The weight of a sperm whale's brain is NORMALLY Distributed with a mean of 15.5
pounds and a standard deviation of 3.6 pounds. What is the probability that a randomly selected sperm whale has a brain that weighs between 10- 20 pounds?    (2) Same question but what is the... more
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Probability & Statistics Statistics

02/23/16

Statistics Question: The % of UCF students that have taken an online course is 40%
In a random survey of 10 UCF students, what is the probability that two or fewer have taken an online course?    The answer is = 0.167 I just am not sure how to get this answer. 
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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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