The highway fuel economy of a 2016 lexus rx 350 fwd 6-cylinder 3.5-l automatic 5-speed using premium fuel is a normally distributed random variable with a mean of μ = 20.50 mpg and a standard deviation of σ = 3.00 mpg. (a) what is the standard error of x¯¯¯x¯ , the mean from a random sample of 36 fill-ups by one driver? (round your answer to 4 decimal places.) standard error of x¯¯¯x¯ (b) within what interval would you expect the sample mean to fall, with 99 percent probability? (round your answers to 4 decimal places.) the interval is from to

a) Standard error = 0.5

b) 99% Confidence interval:  (19.2125,21.7875)

Step-by-step explanation:

We are given the following in the question:

Population mean =  20.50 mpg

Sample standard deviation = 3.00 mpg

Sample size , n = 36

Standard Error =

99% Confidence interval:

Putting the values, we get,

40% off the regular price is the correct answer.

step-by-step explanation:

#15. square

step-by-step explanation:

because quadrilatural (idk how to spell it) means somthing that is not 3d or like, equal sides (or somthing like that   you know what i meanz)

hope this halps!

bai!