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Consider a normal distribution curve where 90-th percentile is at 13 and the 15-th percentile is at 7. Use this information to find the mean and the standard deviation of the distribution.
suppose a manufacturing company makes a certain item. the time to produce each item is normally distributed around a
Using the information provided in part (d) would you be surprised if a sample of 50 differences collected in this way resulted in a higher mean number of unpopped kernels for the store brand than for the name brand?
If test results over long period of time illustrate that 5% of x values are over 2.1 pounds and 5% are under 1.9 pounds, determine mean and standard deviation for population of products produced with this process?
At the .10 significance level, can we conclude that less than 88 percent of the orders are delivered in less than 10 minutes. What is the decision rule?
you are a manager of a 7-eleven. you have determined the probability a customer buys gasoline 0.32. you have also
If they would like to estimate the true average time to within 1.9 minute (with 95% confidence) what sample size should they use? (remember to round to the next largest integer.)
A sociologist is studying the prevalence of crime in one major city. In a sample of 225 randomly selected residents, 60 say that they have been victimized by a criminal.
High School GPA is normally distributed with a mean of 3.06 and a standard deviation of 0.40. The probability of a randomly chosen student having a HS GPA between 3.54 and 3.80 is
let x and s2 be the mean and variance of a random sample size n16 from the normal distribution nu gamma2a find d using
A biologist studying wolves wants to find a correlation between the lifespan of wolves and the geographic latitude of their habitats. How many variables are involved in such an analysis?
a citrus farmer has determined that the diameter of its grapefruits are normally distributed with a mean of 4.5 inches
40 percent of policyholders 55 years or older submit a claim during the year. Fifteen policyholders are selected at randomhow many of the policyholders would you expect to have filed a claim within the last year?
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