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Scores on the Critical Reading part of the SAT college entrance test in a recent year were roughly Normal with mean 997.5 and standard deviation 218. You choose an SRS of 90 students and average their SAT scores. The mean of the average scores you get will be close to
997.5.
997.5/90 ≈11.1.
997.5/ √90≈105
Faced with rising fax costs, a firm issued a guideline that transmissions of 10 pages or more should be sent by 2-day mail instead. Exceptions are allowed, but they want the average to be 10 or below.
a business major wants to determine whether the variation in advertising costs of hair salons is different from the
Find the probability that X is within one standard deviation of its mean. - Find the probability that X is within two standard deviations of its mean.
a datset is provided on a 3 factor factorial on the amount of rot on a potatoe crop. the variables aretype of
question 1harryr.m.pittsthedirectoroflegalofcouncilofvancouverwillhavetomakeanumberoftoughdecisionsin the upcoming
A multiple-choice examination consists of 90 questions, each having possible choices a, b, c, d, and e. Approximate the probability that a student will get at least 21 answers correct if she randomly guesses at each answer.
Baseball salaries Brad Lidge played a crucial role as the Phillies' "closer," pitching the end of many games throughout the season. Lidge's salary for the 2008.
it takes annie an average of 60 sec. to solve a rubiks cube. you come in with a rubiks cube and mix it all up and ask
Suppose that we have a Poisson customer source, which has an arrival rate of 10 customers per hour.
Assume that in a hypothesis test with null hypothesis Ho: μ = 14.0 at a= 0.05, that a value of 13.0 for the sample mean results in the null hypothesis not being rejected. That corresponds to a confidence interval result of:
Carbon monoxide emissions for a certain kind of cary vary with mean 2.9 gm/mi and standard deviation 0.4 gm/mi. A company has 80 of these cars. Estimate the probability that the mean CO level is between 3.0 and 3.1 gm/mi.
Each year Ms. Fontanez has the chance to invest in two different no-load mutual funds: the Go-Go Fund or the Go-Slow Mutual Fund. At the end of each year, Ms. Fontanez liquidates her holdings, takes her profits, and then reinvests.
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