5,341 Answered Questions for the topic probability

Probability Statistics

06/21/21

Find the probability.
It is reported that children between 2 and 6 years old watch an average of 20 hours of TV per week. Assume the variable is normally distributed and the standard deviation is 3 hours. If 20 children... more
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Probability Statistics

06/21/21

What percentage?
The lengths of 5-inch nails manufactured on a machine are normally distributed with a mean of 5.0 inches and a standard deviation of 0.009 inch. The nails that are either shorter than 4.98 inches... more
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Probability Statistics

06/21/21

Find the probability.
Two balls are drawn in succession without replacement from an urn containing 4 red balls and 3 black balls. Find the probability distribution of the number of black balls.
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Probability Statistics

06/21/21

How many committees?
A group of 9 people is going to be formed into committees of 4, 3, and 2 people. How many can be formed if no person can serve on more than one committee?
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Probability Statistics

06/21/21

Find the probability.
In a university, the probability that a student takes calculus or is on scholarship is 0.85. The probability that a student is on scholarship is 0.61 and the probability that a student is taking... more
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Probability Statistics

06/21/21

Find the sample space and probability
A couple has three children.i) Find the sample space for this experiment.ii) Find the probability of getting at least one child of each gender.
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Probability

06/19/21

Probability of 2 different people choosing some of the same marbles from a jar
There are 20,412 unique marbles in a jar. One person picks 11 marbles, and puts them back and the jar is thoroughly mixed. Another person then picks 5 marbles. What is the chance that 2 of the 5... more
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Probability

06/18/21

Probability_Math
​58% of U.S. adults have very little confidence in newspapers. You randomly select 10 U.S. adults. Find the probability that the number of U.S. adults who have very little confidence in newspapers... more
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Probability

06/17/21

need help with this Math question!

In the 2016 referendum on the independence of wales from the UK, approx.44% of welsh population was pro-independence. Suppose we now interview arandom sample of 100 people. What is the probability... more
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Probability

06/16/21

Green, Red and Blue Ball (Probability)
In a bag there are green, blue and red balls. Take one ball off the bag. The probability of taking a green ball is 1/3, and the probability of taking off a blue ball is 1/2. There are 6 red balls.... more
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Probability Math Statistics Act Math

06/15/21

Find the probability that
From a box there are 6 white balls and 4 red balls, then 4 balls are selected, without replacement, at random and transferred to a second box, which is empty.balls are selected at random and... more
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Probability Statistics Act Math

06/15/21

Determine the probability that this student is a) very well prepared, b) poorly prepared.
In a group of 10 students taking the exam, there are 3 who have prepared very well, 4 well, 2 moderately well and one poorly.well, 4 well, 2 moderately and 1 poorly prepared. There are a total of... more
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Probability

06/15/21

Box containing 2 white ball and 3 red ball A={ chosen a ball is red} i) write down elements of A and sample space ii) are the outcomes in A are equally likely? explain and find P(A)
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Probability Math Statistics

06/14/21

Using the set of data, which set has larger variance? Justify the answer without computing the variance of each set of data.
Consider the following data:Data 1 Data 21 142 144 156 152 163 135 121 133 ... more
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Probability Statistics

06/12/21

Finding probability using population mean and sample standard deviation
Greenleaf Lawn Care finds that the population mean cost of leasing homes in the area is $1250. If 20 homes are randomly selected, the standard deviation in the sample is s = $963. What is the... more
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06/12/21

what percent of these differ from the population mean(nomal distribution)
if a set of observations is normally distributed, what percent of these differ from the population mean by more than 0.96σ, where σ is the population standard deviation.
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Probability

06/11/21

Statistics probability

Use a normal approximation to find the probability of the indicated number of voters. In this​ case, assume that 144 eligible voters aged​ 18-24 are randomly selected. Suppose a previous study... more
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Probability

06/11/21

Mathematics Probability
An average of 5 customers come to the shop every half hour. Find the probability that exactly two customers will come to the shop during a given hour2. The life span of an automatic washer is... more
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Probability

06/11/21

What is the distribution of x.
suppose the random varible x has a binomial distribution with p>.5 then the distribution of x isa) skewed to the leftb) skewed to the rightc) normal distributiond) symmetric
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Probability

06/11/21

What is the distribution of x.
suppose the random varible x has a binomial distribution with p>.5 then the distribution of x isa) skewed to the leftb) skewed to the rightc) normal distributiond) symmetric
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Probability Statistics

06/10/21

Problem on bivariate probability distribution

Suppose the bivariate probability distribution of a random vector ( X,Y) is given according to the distribution in the following table ... more
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Probability Statistics

06/10/21

If the equation of the regression line is y = 4.964 + 0.939x, how can it be interpreted?
If the equation of the regression line is y = 4.964 + 0.939x, how can it be interpreted?Select one:a. The slope of the line is .0.939b. Every unit of change in the value of x, the value of y also... more
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Probability

06/10/21

Using a standard deck of cards, what is my probability that I choose a red card, put it back, then I choose a 7
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06/10/21

I need so much help with this question from my Algebra homework very quickly please I am so desperate

Question 1: Identify the variance and the standard deviation of the given data set.{7, 8, 6, 3, 4, 12, 14, 10} A.) variance: 12.75 standard deviation: 12.75 B.) variance: 7.2 standard deviation:... more
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Probability Statistics

06/10/21

Construct Sample

Construct a sample (with at least two different values in the set) of 4 measurements whose mode is larger than at least 1 of the 5 measurements. If this is not possible, indicate "Cannot create... more
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