In a random sample of cell phones, the mean full retail price was $ and the standard deviation was $. Further research suggests that the population mean is $. Does the t-value for the original sample fall between and ? Assume that the population of full retail prices for cell phones is normally distributed.

answer:   y=2x-3

step-by-step explanation:

let x and 400 - x be the two numbers.  

==> 0.80x + 0.85(400 - x) = 400 - 68 from the statement of the problem.  

< ==> 0.80x + 0.85(400 - x) = 400 - 68  

==> 340 - 0.05x = 332  

< ==> -0.05x = -8 ==> x = 160, the first number ==> 400 - x = 240, the second number.