Lunch break: In a recent survey of 669working Americans ages 25 -34, the average weekly amount spent on lunch as $46.16 with standard deviation$2.86 . The weekly amounts are approximately bell-shaped. (a) Estimate the percentage of amounts that were less than . Round the answer to one decimal place.

Approximately ___% of the amounts were less than $40.44 .

$79500

step-by-step explanation:

75000÷100=750750×106=79500

So the first thing we do is to multiply the top equation by 3. the reason i want to do this is i notice there will be a 6y on both equations and can possibly add/subtract them. so we get 6y = -3x + 27. adding that and the second equation we get 6x = 27-15 which is 12. divide by 6 and we get 2. ∴ x = 2. substituting 2 into the first equation we get 2y = -2 + 9 which is 7. divide by 2 and we get 7/2. ∴ y = 7/2, x = 2.