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Assume that the lifetime of batteries in the flashlight is exponentially distributed with the mean of 35 hours. Determine the probability that the batteries will last between 25 and 30 hours?
Let x be a uniform random variable on the interval 1?x?6. What is the standard deviation of x?
The time it takes to completely clean office building follows exponential distribution with mean of 135 minutes. Determine the probability of cleaning an office building in 135 minutes or less?
Suppose the flight time between Atlanta and Salt Lake City is uniformly distributed upon the interval from 220 to 250 minutes. The expected flight time (in minutes) is:
If you're tossing a fair coin 10 times, determine the probability of getting exactly 9 heads out of the 10 coin tosses?
The human resources department has estimated that the amount of unused sick time for individual employees is uniformly distributed between 0 and 480 minutes. Based on this information, what is the p
There are 10 AAA batteries in a box and three are defective two batteries are selected without replacement what is the probability of selecting a defective battery followed by another defective batt
The aptitude test scores of applicants to the university graduate program are normally distributed with mean 500 and standard deviation 60. If university desires to set the cut-off score for graduat
Let x be a poisson random variable with mean lambda. If P(X=1|X<=1)=0.8, what is the value of lambda?
Data from behavioral psychology point out that administering tangible reward to subjects will prompt response levels twice as frequent as from subjects who receive nontangible reward. To test this n
In a management trainee program for multinational corporation, trainees are expected to learn foreign language. Besides classes at the language training institute, tutors are available.
Among 50 randomly chosen customers offered rebates, 25 reduce their electricity use by 10%. Are the differences between the public service appeal and the rebates statistically significant?
A number of nonprofit groups employ fireworks sales as the major fundraiser in the days before the 4th of July. Some of the nonprofits are service groups such as the Veterans of Foreign Wars.
Find the regression line of mean score on time step-by-step. First calculate the mean and standard deviation of each variable and their correlation (use a calculator with these functions). Then find
A congressional committee haves 3 democrats and 6 republicans. A subcommittee of 3 is to be randomly chosen from all subcommittees of 3 which have at least 1 democrat. Determine the probability that
Briefly explain the relationship between the Poisson distribution and exponential distribution and provide an example.
Suppose that the variable 'number of fluid ounces dispensed' is normally distributed. Find the 95% confidence interval for the mean the amount of cola (in ounces) dispensed into the cups by the mach
To calculate beta requires making a "what if" assumption regarding the true population parameter, where the "what-if" value is one that would cause the null hypothesis to be false.
A study was conducted to determine the proportion of children in grades K-4 who eat breakfast before coming to school. A random sample of 500 children in grades K-4 was obtained,
Assume the distribution of skidding distances is normal. Find a 95% confidence interval for the true mean skidding distance.
A study was conducted to examine the proportion of children in grades K-4 who eat breakfast before coming to school. A random sample of 500 children in grades K-4 was obtained,
The Susquehanna River near Bloomsburg has flooded area many times in last 100 years. The following table haves the flood height (in feet) of river near Bloomsburg throughout several of these events.
A random sample of 200 adults was chosen from large city. In this sample, 123 were men and 77 were women. Among men, 83 were homeowners and 40 were renters. Among the women, 53 were homeowners. Assu
A current survey and analysis concludes that 80 percent of all pre-school children enjoy eating ice cream." The statement is example of:
Fereydoun is doing a research project to find out the proportion of Rutgers University students who favor capital punishment. If no preliminary sample of students is taken, how large sample is neces