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A hydrologist collects a liter of water from each of 80 random locations along a stream and measures the amount of dissolved oxygen in each specimen. Suppose that we know that dissolved oxygen varies among locations according to a normal distribution with mean of 5 milligrams per liter (mg/l) and standard deviation of 0.92. Let be the average oxygen content of the 80 specimens. The observed mean is 4.62 mg/l.
(a) Find the mean and the standard deviation of .
(b) What distribution does follow?
(c) What is the probability that is at most the observed value of 4.62?
Probability : Independent Dual Probability, A student applies for two different scholarships. The probability of receiving the first scholarship is 0.3 and the probability
elena's daughter sold 102 boxes of girl scout cookies she was told that this amount represnted 5%of the troop sale how many boxes did the troop sale?
Find the standardized test statistic t for a sample with n = 12, = 17.4, s = 2.1, and if Round your answer to three decimal places.
Also, suppose the obstruction is a square, 1m on a side, and is parallel to the screen. Express the area of the shadow as a function of the distance from the light to the obstruction.
Calculate the odds ratio.
Isomorphisms, Residue Classes and Multiplication Tables, Show that U(10) is isomorphic to Z_4 and write out the isomorphism explicitly.
A person repeatedly and independently flips a coin to decide whether to take a step to the left or to the right from a point X. determine the expected number of times the person returns to X.
Suppose you want to collect a sample of certain size from a continuous population to satisfy given confidence level and margin of error. What formula do you use to determine the sample size if you know the population proportion?
Find the force exerted by the water against the gate (w = 62.4).
Describe the kinds of actions or things that a teacher should be doing in each of the three parts of a lesson. (Note that not all of these would be done in every lesson.) Which actions should you use almost all of the time?
For the following set, which number has the largest absolute value?
A password for certain computer system consists of 3 lower-case letters (a-z) followed by 3 digits (0-9).
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