A company is testing a new device to detect certain substances inside suitcases. Currently, the device is accurate 68% of the ti
me for suitcases that have these substances. In a test where half of the 70 test suitcases carry these substances, about how many times will the test identify a suitcase with the substance as not having it?
There are 70/2 = 35 suitcases with the substance. The probability of not detecting the substance is 1.00 - 0.68 = 0.32. Therefore the expected number of times the substance is not detected is:
2.40/12 = x/16 then that would mean 12x= 2.40(16) which equals 12x= 38.4, then divide 12 by both sides, getting you 3.2 so the answer is it would cost her $3.20 cents to by 16 lemons
