SOLUTION: Cindy's job is to check computer printers for defects. Out of 420 printers she has to check, only 3 of the first 84 have been defective. Using this information, what is the best

Question 161870: Cindy's job is to check computer printers for defects. Out of 420 printers she has to check, only 3 of the first 84 have been defective. Using this information, what is the best prediction of the total number of printers in this group that will be defective?
I know that 420/84 is 5 and that 5x3=15, but how do you set up the problem?
Answer by actuary(112) (Show Source): You can put this solution on YOUR website!
3 (defectives found)/ 84 (first printers checked) = total defective (x) / 420 (total number of printers). This is the equation that expresses the proportions Therefore, x = (3*420)/84 (Solving for x)
x = 15
RELATED QUESTIONS
Mary is printing flyers for a campus event. She is using two printers to make the copies, (answered by josgarithmetic)

Hi, I need help on the following stats problem... Thanks in advance. A computer store... (answered by stanbon)

Two printers are put to work printing 200 copies of a document. One of the printers takes (answered by josgarithmetic)

Kayla's copy store recived an order for 5,616 copies. The store has 3 printers. If Kayla... (answered by Edwin McCravy,stanbon)

A manufacturer has determined that the revenue from selling x inkjet printers is given by (answered by stanbon)

Laser printers are becoming more and more affordable; PC Today (Vol.11, No. 4) gave the... (answered by ikleyn)

You are producing a commemorative booklet for the 25th anniversary of your church. Ace... (answered by josgarithmetic)

*please help me solve this: Quality-control studies for Speedy Jet computer printers... (answered by stanbon)

An electronic toy manufacturer uses a particular kind of quality test to check the toys. (answered by stanbon)