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For samples of the specified size from the population described, find the mean and standard deviation of the sample mean . The population mean and the population standard deviation of the sampled population are, respectively, 55.7 and 3.8. n=256
(A) μ = 3.8; σ = 0.2
(B) μ= 14.1; σ = 1.1
(C) μ = 0.2; σ = 55.7
(D) μ = 55.7; σ = 3,8(E) μ = 55.7; σ = 0.2375.

Respuesta :

Answer:

mean of sample is 55.7

sample standard deviation is  0.2375

Step-by-step explanation:

given data

population mean  = 55.7

population standard deviation = 3.8

n = 256

to find out

the mean and standard deviation

solution

we know directly mean of sample is mean of population

i.e. mean of sample = 55.7

and standard deviation will be calculate by this formula

sample standard deviation = population standard deviation / [tex]\sqrt{n}[/tex]

sample standard deviation =  3.8 / [tex]\sqrt{256}[/tex]

sample standard deviation =  3.8/ 16

sample standard deviation =  0.2375

so last option is right

(E) μ = 55.7 , σ = 0.2375.

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