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A recent report indicated an average family of four (2 parents and 2 children under the age of 16), spends $500 per month on gasoline. Assume the distribution of gasoline consumption expenditures for a family of four (2 parents and 2 children under the age of 16) 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 $450 but less than $500?
b. What percent of the families spend less than $425?
c. What percent spends between $425 and $575?
d. What percent spends between $575 and $650?
Variance hour 100 and battery y: sample size 12,mean hour 1020,variance hour 121. can you conclude that two types of batteries are having the same mean life?
A student is taking a multiple choice exam in which each question has four choices . Assume that the student has knowledge of a correct answer to any of the questions.
a 2004 survey of randomly sampled utah residents found that 10.5 0.105 of them smoked regularly.a suppose you survey
Random sample of 100 voters showed that 55 of those sampled will vote for her. Is it likely that her assertion is correct at the 0.05 level of significance?
A federal report find that a lie detector test given to truthful persons have a probability of 0.2 of suggesting that the person is deceptive. A company asks 12 job applicants to take a lie detect test. Suppose that all 12 applicants answer truthf..
In this the anniversary of the sinking of the Titanic, it is interesting to look at the distribution of those who survived, and those who died. The table below describes the number of men, women and children who were passengers on the Titanic.
When the accountants for lose-a-digit Computer, Inc. had finished preparing their annual budget, they presented the final figures to the president, I.M. Smart.
Mr. James McWhinney, President of Daniel-James Financial Services, believes there is a relationship between the number of client contacts and the dollar amount of sales.
seventy percent of the bicycles sold by a certain store are mountain bikes. among 100 randomly selected bike purchases
Let X1,... x30 be independent Poisson random variables having mean 1. (a) Use Chebyshev's inequality to find a lower bound on the probability.
A company ships computer components in boxes that contain 20 iteams. Assume the probability of a defective component is .4. use the geometric distribution to find the probability that the first defect is found in the third or fourth component test..
in class we discussed what fraction of 7-foot or taller males of an appropriate age play in the nba. this exercise
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