Experience has shown that a grade in MAT 2371 is normally distributed with mean 66 and variance 64. Assume that the grades are independent of each other. What proportion of the class will get a grade of at least 80? O 0,5656 0.0401 0.5871 0.9599 0.4129

Q: Assume that adults have iq scores that are normally distributed with a mean of 100 and a standard…

A: Solution: Let X be the adults IQ score has normally distributed with mean μ=100 and standard…

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A: It is an important part of statistics. It is widely used.

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A:

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A:

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Q: Suppose the variance of X is 33. What is the variance of .23X?

A: Given,Var(X)=33 we know that Var(ax)=a2Var(X)

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Q: What's the variance i dont under stand

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Q: SAT scores are normally distributed with a mean of 1,800 and a variance of 22,500. Given arandom…

A:

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Q: During a wisdom teeth removal procedure, 1, 2, 3, or 4 wisdom teeth are removed, depending on the…

A: (a) Obtain the mean of the sampling distribution of the sample mean. The mean of the sampling…

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A:

Q: Suppose that vehicle speeds at an interstate location have a normal distribution with a mean equal…

A: Here, µ = 70 mph and σ2 = 25 mph.

Q: In the African savannah, elephants like to eat very young trees. Imagine that, in a section of the…

A:

Q: If the correlation is .8, then 40% of the variance is explained?

A: The given statement is incorrect.

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Q: Suppose a sample of n = 160 observations has a mean of 13.6 and a variance of 6.8.  If each value in…

A: Let's denote the original sample as X .Given ,Mean()=13.6Variance()=6.8Sample size(n)=160

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A: From the given information, the tail of the test is left tail test. From the output, the T statistic…

Q: If a data set has 16 values and a standard deviation 9.4, then the variance is

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Q: Fifty students took a Mathematics exam. Assume that their scores formed a normal distribution with a…

A: Solution-: Given: μ=80,σ=4 We find x such that, P[X>x]=0.025