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A fifth grader takes a standardized achievement test (mean = 125, standard deviation = 15) and scores a 148. What is the child's percentile rank?
De?ne a four-state continuous-time Markov chain that jointly describes the condition of the two machines. Use the assumed independence to compute the transition probabilities for this chain and then verify that these transition probabilities satis..
Estimate the mean mathematics ACT score for all statistics students at this college. Give the 95% confidence interval and what is the probability that for the second sample, the mean commute distance will be less than 29.6 miles?
based on a study of salaries of man and women who drive expensive cars a researcher concludes that owning an expensive
A particular factory can only inspect 46 mice per hour with a standard deviation of 10. At alpha=0.02 company have reason to believe that these inspectors are slower than average?
a. How much toothpaste would you expect to be remaining?
by means of a scatter diagram determine if there is a relationship between hours of machine use and millimeters of the
Step 1: Find the expected value E(X). Step 2: Find the standard deviation.
the average hourly wage of workers at a car wash is 6.50hr. assume the wages are normally distributed with a
Examine several newspapers and magazines and describe at least three examples of functions that appear. What is the domain and range of each function?
A survey of 120 high school students shows that 39 of them work over 20 hours per week during the school year. Does it demonstrate the conjecture that more than 25% of the high school students work over 20 hours per week during the school year?
suppose the u.s. president wants an estimate of the proportion of the population who support his current policy toward
at time 0 a box contains one pen and one pencil. at each time n after a item is chosen at random from the box and put
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