843 Answered Questions for the topic Statistics Question

02/07/18

If the bookstore stocks 86 copies of the magazine, for what percentage of weeks will there be an insufficient number of copies to meet demand?
i need help on this problem. It's for statistics
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02/05/18

which type of lottery ticket is purchased the most at a local gas station
is this question statistical
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02/04/18

Can anyone answer this question
At a factory that produces pistons for cars, Machine 1 produced 606 satisfactory pistons and 404unsatisfactory pistons today. Machine 2 produced 880 satisfactory pistons and 220 unsatisfactory... more
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02/02/18

find the probability
A company produces steel rods. The lengths of the steel rods are normally distributed with a mean of 175.6-cm and a standard deviation of 1-cm.Find the probability that the length of a randomly... more
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01/26/18

Is this biased or not biased and why....What is your favorite soft drink? Sample is chosen by picking names out of a telephone book.
I say unbiased but my cousin says biased so I am lost
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01/23/18

For the standard normal distribution, find the area within one standard deviation
For the standard normal distribution, find the area within one standard deviation of the mean that is, the area between μ − σ and μ + σ. Round to four decimal places.   Show complete steps.
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01/21/18

Suppose 52 cars start at a car race. In how many ways can top 3 cars finish the race? The number of different top three finishes po
Suppose 52 cars start at a car race. In how many ways can top 3 cars finish the race? The number of different top three finishes possible for this race of 52 cars is
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01/17/18

the median of a set of eight numbers is 4 1/2.given hat seven numbers are 9,2,3,4,1,12,13,find the eighth number
mean median mode  
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01/17/18

mean question of statistics.
the mass of a group of children are 9,11,13,13,15,15,15,a,18,20. given that the median mass is 0.4 greater than the mean mass, find the value of a and state the modal mass.
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01/16/18

please help me !
An anatomy teacher hypothesizes that the final grades in her class are distributed as 10% A's, 23% B's, 45% C's, 14% D's, and 8% F's. If at the end of the semester she has the following grades was... more
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01/08/18

A distribution of values is normal with a mean of 225.5 and a standard deviation of 3.2.
A distribution of values is normal with a mean of 225.5 and a standard deviation of 3.2.Find the probability that a randomly selected value is greater than 222.6. P(X > 222.6) = Enter your... more
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01/08/18

A company produces steel rods. The lengths of the steel rods are normally distributed with a mean of 142.7-cm and a standard deviation of 2.2-cm.
A company produces steel rods. The lengths of the steel rods are normally distributed with a mean of 142.7-cm and a standard deviation of 2.2-cm.Find the probability that the length of a randomly... more
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01/06/18

please help me its a statistic question
It has been reported that 60% of all internet users have been attacked by viruses. If 16 people are randomly surveyed, find the following probabilities: a. At least 6 have been attacked b. No... more
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01/06/18

It has been reported that 25% of all cars on the highway are traveling at speeds in excess of 70 mph. If the speeds of eight random automobiles are measured v
It has been reported that 25% of all cars on the highway are traveling at speeds in excess of 70 mph. If the speeds of eight random automobiles are measured via radar: a. What is the probability... more
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12/31/17

A psychology professor of a large class became curious as to whether the students who turned in tests first scored differently from the overall mean on the test
6. A psychology professor of a large class became curious as to whether the students who turned in tests first scored differently from the overall mean on the test. The overall mean score on the... more
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12/29/17

Standard deviation of lifespan
Within a population of 70 flies, the average lifespan is two months. 60 of the flies live an average of 1.5 months. What is the average standard deviation, in months, of the lifespan of the... more
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12/28/17

confidence level of a statistical test?
If α = 0.10, what is the confidence level of a statistical test? Based on the α level of the question to the left, whatcritical value is used to form the confidence interval?
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12/12/17

Statistics Problem
1) A survey from the Department of Motor Vehicles was given to local residents in the city of Slothville. The results showed that 60% held a valid driver's license. Of the individuals who held a... more
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12/10/17

Normal distribution table
What is the time spent waiting on a kidney transplant, using the standard normal distribution table.  THe mean is 1672 and standard deviation is 209.9.  what waiting time represents the 85%  
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12/05/17

If you had a large collection of data, how might you go about determining whether the distribution was normal?
Question 81 Pge 750 in Math 120.
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12/05/17

Your report should have a conclusion section written in “non-statistical” style that clearly summarizes the major conclusions from the final analysis and discus
Data Code Book  - can send you the data set  
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12/05/17

Statistics question?
A particular group of men have heights with a mean of 171 cm and a standard deviation of 8 cm. Carl had a height of 174cm.?.a. What is the positive difference between Carl's height and the mean? b.... more
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12/04/17

For a normally distributed set of data, the percentage of data less than a z-score of 0.83 is
what is the percentage?
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12/04/17

For a normally distributed set of data, find the area under the normal curve for the region between z-scores of 0.74 and 1.62
What is the area?
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12/04/17

In a normally distributed set of data, the mean is 30 and the standard deviation is 5. Find the piece of data that has a z-score of -1.24
 How do I find the data with that z-score?
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