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Assume the speed of vehicles along a stretch of I-10 has an approximately normal distribution with a mean of 71 mph and a standard deviation of 8 mph. What proportion of the vehicles would be going less than 50 mph?
If the probability that she dies in the coming year is 0.001, what is the expected gain for the insurance company?
Temperature in a certain city for the month of June follows a uniform distribution over the interval 61º F to 91º F. What is the probability that a randomly selected June day has a temperature that exceeds 70º F?
A biometric security devise using fingerprints erroneously refuses to admit 1 in 1000 authorized persons from a facility containing classified information. The device will erroneously admit 1 in 10,00,000 unauthorized persons.
a multiple choice exam has 10 questions. each question has 4 possible answers of which one is correct. a student
construct a 95% confidence interval for the weekly average expenditure on fast food for adults 24 years of age and under. Assume fast food weekly expenditures are normally distributed.
1.i have three groups for which i want to perform an anova. they have standard deviations s1 2.5 s2 3.4 s3 6.4 and
1. Develop histograms showing the distribution of rivet diameters from the original and new supplier correct answer. 2. Compute the sample means and standard deviations for the two sets of data.
Such things as historical documents, newspaper reports, TV and radio broadcasts, when used in research, represents
She wants to be 95% confident that her estimate is correct. If the standard deviation is $1050, how large a sample is needed to be accurate within $200?
suppose you want to test the claim that mu!=3.5 with standard deviation unknown. Given a sample size of n = 40 and a level of significance of alpha=.05, when should you reject H0.
a real number x is drawn at random from the interval 01. a rectangle is formed with sides x and 1-x. denote the area by
Find the mean and standard deviation for the number of left-handed students in such classes of 25 students.
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