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During an annual heating season, the average hydro bill for customers in homes in Fredericton, New Brunswick was $457, with a standard deviation of $80. Assume that the gas bills follow a normal distribution, and let X be a random variable for the gas bill amount of a randomly selected Fredericton home.
(a) What proportion of homes had a gas bill (1) over $382, and (2) between $497 and $537?
(b) What bill amount was exceeded by (1) only 3% of homes, and (2) by 93% of homes?
question find the probability that in 200 tosses of a fair die we will obtain at least 40
a psychology department chair notices that the average number of student complaints the department receives per week is
the american veterinary association claims that the annual cost of medical care for dogs averages 100 with a standard
suppose x is a normally distributed random variable with mu 13 and sigma 2. find each of the following probabilities
A researcher wanted to invetigate whether there is a significant difference in the average age of instructors, assistant professors, assocated professors and full professors at a university. The faculty was selected at random and their ages were r..
The mean height of women in a country (age 20-29) is 64.3 inches. A random sample of 75 women in this age group is selected. what is the probablity that the mean height for the sample is greater than 65 inches?
The mean SAT verbal score is 478, with a standard deviation of 98. Use the Empirical Rule to determine what percent of the scores lie between 380 and 478. (Assume the data set has a bell-shaped distribution)
The issue of how much should be spent to solve particular U.S. social problems is a complex matter, and people have diverse and conflicting ideas on these issues.
Assume men's weights are normally distributed w/ a mean of 172 lb. and a s.d. of 29lb.
Choice of exponential smoothing constant w has little or no effect on forecast values using exponential smoothing.
Use descriptive statistics to explain how parental involvement and interests in child's education can impact on educational attainment measured in terms of their numeracy (v24_7), literacy (v28_7) and creativity skills (v25_7 and v26_7)
Distribution and the method of moments estimators of the parameters are alpha(hat)= 5.23 and lambda(hat) = 21.3. Find an asymptotic 95% confidence interval for alpha.
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