A quality control technician has a batch of 25... to inspect. She must select a sample of 5 parts to check. How many 5 parts are possible. How do you come about finding the answer? I'm confused. Thanks!
2007-04-21 12:34:15 · 6 answers · asked by Miah M 1 in Science & Mathematics ➔ Mathematics
I don't' know it just says a QC tech has a batch of 25 parts to inspect. She must select a sample of 5 parts to check how many 5 part samples are possible?
2007-04-21 12:54:29 · update #1
order dependent of independent?
2007-04-21 12:38:58 · answer #1 · answered by Anonymous · 0⤊ 0⤋
25/5 = 5 parts
2007-04-21 12:41:56 · answer #2 · answered by misa 2 · 0⤊ 0⤋
This is a combination problem where the order does not matter. The combination equation is as follows
C(n,r) = n!/(r!(n-r)!)
Where n is the number of combinations taken r at a time. so n = 25 and r = 5.
25!/(5!20!) = 53130
I'm a math tutor, you should check out my site www.j-digital.net.
! is the factorial symbol. 5! = 5*4*3*2*1 = 120
Hope that helps!
2007-04-21 13:01:14 · answer #3 · answered by JDigitalTutoring 2 · 0⤊ 0⤋
This is a problem that uses combination mathematics.The tech doesn't care what order the objects are taken in. She just needs a group of 5 objects to test. This want you to calculate the number of a combinations of 5 objects that can be taken from a total of 25.
2007-04-21 13:01:52 · answer #4 · answered by pschroeter 5 · 0⤊ 0⤋
Your textbook should give you an equation for doing this. plus in the numbers and you're done... Faster than asking here and waiting for an answer.
2007-04-21 12:41:16 · answer #5 · answered by Ken H 4 · 0⤊ 0⤋
Does it matter which part he checks first? If it doesn't, you can use combination. If it matters, use permutation.
2007-04-21 12:47:54 · answer #6 · answered by rEi 3 · 0⤊ 0⤋