A population has mean 16 and standard deviation 1. The mean of X for samples of size 80 is (a) 16 b) 20 c) 19 d) 18 . A population has mean 16 and…

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. A population has mean 16 and standard deviation 1.7. The mean of X for samples of size 80 is(a) 16 b) 20 c) 19 d) 18 . A population has mean 16 and standard deviation 1.7. The standard deviation of X’ for samples of size 80 is(a) 0.1901 b) 0.1009 c) 1.901 cl) 0.1221 . We select a random sample oi 39 observations from a population with mean 81 and standard deviation 5.5 The probability that the sample mean is more than 83 is roughly.(a) 0.0501 b) 0.0714 0) 02315 d) 0.0116 . The number of gallons of carbonated soft drink oonsumed per person annually is nor-mally distributed with mean 47.5 and standard deviation 3.5. Twentyifive people areselected at random. The probability that the average number of gallons of carbonatedsoft drink they each consume per year is between 45 and 50 gallons is about (a) .6723 b) .5222 c) .3571 d) 1.0000 . Suppose that in one region of the country the mean amount of credit card debt perhousehold in households having credit card debt is $15,250 with standard deviation$7,125 The probability that the mean amount of credit card debt in a sample of 1600such households will be within $300 of the population mean is roughly

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