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The weekly amount spent for maintenance and repairs in a certain company has an approximately normal distribution with a mean of $600 and a standard deviation of $40. If $700 is budgeted to cover repairs for next week, what is the probability that the actual costs will exceed the budgeted amount?
It has been reported that 3% of all cars on the highway are traveling at speeds in excess of 70 mph. If the speeds of four random automobiles are measured via radar, what is the probability that at least one car is going over 70 mph?
What is the probability that the average time spent per customer will be at least 3 minutes?
Find a 95% confidence interval for the true proportion of all medical students who plan to work in a rural community.
Identify each of the random variables as continuous or discrete.
A population consists of the following four values: 8, 10, 12, and 16. From this population, there are 6 different samples of size 2. The means of the 6 samples of size 2 are: 9, 10, 12, 11, 13, and 14. Compute the mean of the distribution of the ..
A random sample of 346 individuals is selected, and the individuals are classified according to their smoking habits and the smoking habits of their parents. The results are given in the contingency table below.
compute the correlation coefficient for the data below. what is the equation for the regression line if n=7, Ex=69, Ey=528 Exy=4754 and Ex^2=825
The dimension is supposed to be 224 mm and the variance is unknown for the manufacturing process. Is there evidence that the mean dimension is not 221 mm? Assume the population is normally distributed. Use a = 0.05 and the critical value value met..
assuming all sex distributions to be equally probable what proportion of families with exactly six children should be
an important application of regression analysis in accounting is in the estimation of cost. by collecting data on
Basic Biostatistics is a concise, introductory text that covers biostatistical principles and focuses on the common types of data encountered in public health and biomedical fields.
The average time a subscriber spends reading the Wall Street Journal is 49 minutes. Assume that the standard deviation is 16 minutes and the time are normally distributed .
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