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anonymous
 one year ago
A worker takes a random sample of 320 bolts and finds that 30 of them are either too long or too short, thus making them unusable. Estimate the number of unusable bolts in a production of 14,000 bolts.
1,313 bolts
1,400 bolts
1,300 bolts
1,320 bolts
anonymous
 one year ago
A worker takes a random sample of 320 bolts and finds that 30 of them are either too long or too short, thus making them unusable. Estimate the number of unusable bolts in a production of 14,000 bolts. 1,313 bolts 1,400 bolts 1,300 bolts 1,320 bolts

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JoannaBlackwelder
 one year ago
Best ResponseYou've already chosen the best response.1Can you find the probability of unusability using the 320 bolts with 30 of them unusable?

JoannaBlackwelder
 one year ago
Best ResponseYou've already chosen the best response.1No, it's the same formula as last time.

JoannaBlackwelder
 one year ago
Best ResponseYou've already chosen the best response.1(number of unusable/total number)*100

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0@JoannaBlackwelder Well 30 were unusuable it said and the total number was 14,000, so it's 30 / 14,00 * 100?

JoannaBlackwelder
 one year ago
Best ResponseYou've already chosen the best response.1We don't know how many are unusable when we have 14,000 total. That is what we are looking for. But we have both numbers when the total is 320 and the number unusable is 30.

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Ok, so then it would be 30/320 right?

JoannaBlackwelder
 one year ago
Best ResponseYou've already chosen the best response.1Right, *100 :)

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0And then that is 0.09 and I would times that by 100 ?

JoannaBlackwelder
 one year ago
Best ResponseYou've already chosen the best response.1Yep, I get 9.375 to be precise. :)

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Lol, right, so then...is there another step? To get it to be one of the answers?

JoannaBlackwelder
 one year ago
Best ResponseYou've already chosen the best response.1Then we can use that value in the same formula, but when the total is 14,000

JoannaBlackwelder
 one year ago
Best ResponseYou've already chosen the best response.1So, 9.375=(number unusable/14,000)*100

JoannaBlackwelder
 one year ago
Best ResponseYou've already chosen the best response.1See how I wrote that formula?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Lol, not really...I got 0.066

JoannaBlackwelder
 one year ago
Best ResponseYou've already chosen the best response.1It is probability = (number unusable/total number)*100

JoannaBlackwelder
 one year ago
Best ResponseYou've already chosen the best response.1How did you get .066?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0I did 9.375 / 14000 * 100

JoannaBlackwelder
 one year ago
Best ResponseYou've already chosen the best response.1No, the 9.375 is the probability, not the number of unusable.

JoannaBlackwelder
 one year ago
Best ResponseYou've already chosen the best response.1dw:1432918347029:dw Any ideas how to solve?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Oh, okay, so...30 is still the number of unsuable then I divide that by 14000 and times it by 100?

JoannaBlackwelder
 one year ago
Best ResponseYou've already chosen the best response.1No, the number unusable is what we are solving for in the equation I wrote above.

JoannaBlackwelder
 one year ago
Best ResponseYou've already chosen the best response.1No, the 14000 is in the denominator and 100 is in the numerator, so we don't multiply those.

JoannaBlackwelder
 one year ago
Best ResponseYou've already chosen the best response.1dw:1432918612846:dw

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Oh so 100 divided by 14000 which is 0.007?

JoannaBlackwelder
 one year ago
Best ResponseYou've already chosen the best response.1To clear the fraction, we can multiply both sides by 14000dw:1432918686742:dw

JoannaBlackwelder
 one year ago
Best ResponseYou've already chosen the best response.1Yeah, we could do it that way too. :)

JoannaBlackwelder
 one year ago
Best ResponseYou've already chosen the best response.19.375=0.00714unusable

JoannaBlackwelder
 one year ago
Best ResponseYou've already chosen the best response.1Can you finish solving for unusable?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Yeah, so rounding it up it would be 1, 313? unusable Right?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0@JoannaBlackwelder Thank you kindly for your help, and also for being so patient, lol as you can see I'm really not the best at math. XP :)

JoannaBlackwelder
 one year ago
Best ResponseYou've already chosen the best response.1No worries. It takes practice. :) Happy studies!
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