5,341 Answered Questions for the topic probability

Probability Statistics

06/17/20

I need help with a problem from my statistics homework. I don't understand this...
A particular fruit's weights are normally distributed, with a mean of 640 grams and a standard deviation of 26 grams.If you pick one fruit at random, what is the probability that it will weigh... more
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Probability Statistics

06/17/20

I need help with a problem from my statistics homework. I don't understand this...
A manufacturer knows that their items have a normally distributed lifespan, with a mean of 4.1 years, and standard deviation of 0.7 years.If you randomly purchase one item, what is the probability... more
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Probability Math Calculus Statistics

06/17/20

I need help with a problem from my statistics homework. I don't understand this...
A manufacturer knows that their items have a normally distributed lifespan, with a mean of 12.4 years, and standard deviation of 1.7 years.The 3% of items with the shortest lifespan will last less... more
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06/16/20

Statistics Probability Question

A jar of candy contains 45 red jellybeans, 30 green jellybeans, and 60 purple jellybeans. Find the following probabilities. Q: Now suppose 6 jellybeans are selected without replacement instead.... more
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Probability

06/15/20

I want to solve a problem with probability

90% of the children in a developing country have caries, 85% have worms and 70% are undernourished. How high is the percentage of children who have all three ailments?a) At least 70% of the... more
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Probability

06/15/20

What is the expected number of dinner meals eaten at home per week?
A family has the opportunity to eat 7 dinner meals at home per week. The following chart shows the number of dinner meals eaten at home per week, x, and the associated probability P(x) for each... more
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Probability

06/15/20

a) Construct a possibility tree and determine the sample space of this experiment.

According to genetics theory, 37% of all humans have attached earlobes. Experiment: two people are selected at random and it is determined whether or not each has attached earlobes. b) Consider... more
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Probability

06/15/20

What is the probability that the freshman had less than 2 incorrect answers?
The following chart shows the number of questions that incoming freshmen got incorrect on a mathematics placement test along with the associated frequencies: Number wrong Frequency 0 ... more
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Probability

06/15/20

Suppose you play a game in which you roll one die, and the payoff is the number of dots showing. What is the variance of this game?
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Probability

06/15/20

Suppose a survey of 20 students was taken as they walked out of the cafeteria with regards to their age. The results are listed in the table:
Q12. Suppose a survey of 20 students was taken as they walked out of the cafeteria with regards to their age. The results are listed in the table: Older than 30 30 or... more
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Probability Statistics Maths

06/13/20

binomial distribution

A fair 5-sided spinner has sides numbered 1, 2, 3, 4 and 5 The spinner is spun once and the score of the side it lands on is recorded. (a) Write down the name of the distribution that can be used... more
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Probability Math Statistics Decimals

06/12/20

z score in statistics

Find the Z score that most closely corresponds to an area of 0.379 on the left.
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06/12/20

probability in statistics

The number of hours an American adult sleeps each night follows a Normal distribution with an average of 6.9 hours per night with a standard deviation of 0.68 hours. If we randomly select one... more
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06/12/20

Probability in statistics and standard deviation

The number of hours an American adult sleeps each night follows a Normal distribution with an average of 6.9 hours per night with a standard deviation of 0.68 hours. If we take a random sample of... more
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Probability

06/11/20

You roll a 6 sided die what is p(odd) write your answer as a percentage

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Probability

06/10/20

Probability math
a) P(A or B) = p(A) + p(b)P(A) = 0.04P(B) = 0,025P(A or B) = 0,04 + 0,025 = 0,065b) Still don't know the answer to b. I hope some of you could give me the answer. and the way you came to the answer
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Probability

06/10/20

What is the probability
What is the probabilityA copy center has two copyphotos. The likelihood that the machines will require service for a random week is, after long experience, estimated P(A) = 0.040 for one and P(B) =... more
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Probability

06/10/20

What is the probability
A copy center has two copyphotos. The likelihood that the machines will require service for a random week is, after long experience, estimated P(A) = 0.040 for one and P(B) = 0.025 for the other... more
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Probability

06/10/20

this is my question, can someone help me with it .
Q‒2. A box contains 24 transistors, 4 of which are defective. If 4 are sold at random, find the following probabilities. a) Exactly 2 are defectives.b) None is defective.  c) All are defective.d)... more
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Probability

06/10/20

When you flip a biased coin the probability of getting a tail is 0.52. Find the probability of getting a head.

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Probability

06/09/20

3 plain pencils and 5 pens in first box. 4 colored pencils and crayons in second box. One item from each box selected at random. What is probability that a pen and crayon are selected

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Probability

06/09/20

whats the answer to this question?
For the set of whole numbers from 1 to 20 inclusive,Tammy knows that some numbers are divisible by 5 and some numbers are odd.She is going to write each number on a different ball and place the... more
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Probability Statistics

06/08/20

See below: Is this selection process biased?
An elementary school is having a fund raiser to add new books to the library. To encourage participation, the top twenty sellers will be placed in a drawing from which four will be selected to... more
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Probability Statistics

06/08/20

Probability and Statistics questions, type of samplings!!
our friend conducted a study on the number of calories in bottles of sports drinks. He went to his kitchen and recorded the calories of the sports drinks in the refrigerator. What kind of sampling... more
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Probability

06/08/20

how do i work this out?
. On a certain road section passed by 180 cars hourly 7% of drivers are speeding. What is the probability that a speed camera place on this section of the road for two hours captures... more
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