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A resent report indicated an average family of four 2 parents and 2 children under the age of 16, spends $500 per month on gaoline. Assume the distribution of gasoline consumption expenditures for a family of four follows the normal distribution, with a standard deviation of $75 per month. round your answer to 2 decimals.
a. What percent of families spend more than $45 but less than $500
b. What percent of the families spend less than $425
c. What percnet spends between $425 and $575
d. What percent spends between $575 and $650
What proportion of observed variation in hardness can be explained by the simple linear regression model relationship between hardness and elapsed time? (Give the answer to three decimal places.)
sentinal phoneback answers customer enquiries with telephone calls. when they timed a sample of 40 calls they found a
The specification that true average penetration be at most 50 mils. They will be used unless it can be demonstrated conclusively that the specification has not been met. What would you conclude?
Factor the polynomial completely. Factor each completely given that the binomial following it is a factor of the polynomial.
Find the probability that the student 's test score is more than 39.8. Find the probability that the student's test score is between 33.5 and 41.9.
suppose the present value of a risky investment is approximately normally distributed with mean 10000 and standard
what are the basic characteristics of a normal distribution and the normal
Distributed with the following parameters: μ1 = 100, σ1 = 4, μ2 = 75, σ2 = 4, μ3 = 75, and σ3 = 2. What is the probability that an assembly chosen at random will have combined dimension in excess of 262?
A polling organization plans to sample 1000 adult Americans to estimate the proportion of Americans who think crime is a serious problem in this country. (a) What is the parameter of interest to the polling organization? (b) What will be the stati..
The stem-and-leaf display below gives the test scores for the students in Prof. Jones' economics class. Use the display to answer the following questions.
Then comment on the effectiveness of the presentation: Were the frequency distributions used effectively to report the results? Why or why not?
the lengths of pregnancies are normally distributed with a mean of 268 days and standard deviation of 15 days if 64
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