beevus2666

20.11.2019 • 

Mathematics

Suppose x has a distribution with a mean of 75 and a standard deviation of 45. random samples of size n = 81 are drawn.

(a) describe the x distribution and compute the mean and standard deviation of the distribution.

(b) find the z value corresponding to x = 90.

(c) find p(x < 90).

(d) would it be unusual for a random sample of size 81 from the x distribution to have a sample mean less than 90? explain.

Ответ:

spearjj

02.11.2021

Mathematics

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Apossible answer: f(x) = 2*sqrt(x)g(x) = x + 8we want to make h(x) a composite function.g(x) is the inside function. f(x) is the outside.at a glance, it looks like h(x) = 2√(x+8) has an "inside" expression of x+8 and an outside shell of 2√(stuff).so if we choose f(x) = 2√(x) and g(x) = x + 8, this will compose ash(x) = f( g(x) )        = 2√(x+8)

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