anonymous
  • anonymous
Shiming, Doreen, and Brian are studying independently for their driver’s license test. The probability Shiming will pass the test is 3/5, the probability Doreen will pass the test is 3/28, and the probability Brian will pass the test is 3/10. What is the probability at least one of these people passes the test?
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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ganeshie8
  • ganeshie8
i think we can find probability for NONE of them will pass. and subtract it from 1
ganeshie8
  • ganeshie8
probability for none of them passing = (1-3/5)(1-3/28)(1-3/10)
anonymous
  • anonymous
So it's 2/5 * 25/28 * 7/10?

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More answers

ganeshie8
  • ganeshie8
1- that
anonymous
  • anonymous
So it's 7/8?
ganeshie8
  • ganeshie8
wolfram says 3/4
ganeshie8
  • ganeshie8
pls do check if there is some flaw in my logic.. . im feeling slight dyslexic today...
anonymous
  • anonymous
Let's see...your logic is correct, but I don't understand it...
ganeshie8
  • ganeshie8
i thought like this : P(atleast one of them passing) + P(none of them passing) = 1
ganeshie8
  • ganeshie8
P(atleast one of them passing) = 1 - P(none of them passing)
ganeshie8
  • ganeshie8
P(none of them passing) = P(A') . P(B') . P(C') note that these are mutually exclusive evens. one guy passing doesnt depend on other guys passing...
anonymous
  • anonymous
But why did you have me subtract one form A, B, and C and then subtract again?
ganeshie8
  • ganeshie8
becos, P(A) + P(A') = 1
ganeshie8
  • ganeshie8
we are given P(A) <---- p(A passing) we need P(A') <------ p(A not passing)
ganeshie8
  • ganeshie8
P(atleast one of them passing) = 1 - P(none of them passing) P(none of them passing) = P(A') . P(B') . P(C')
ganeshie8
  • ganeshie8
we have used both above equations
anonymous
  • anonymous
Oh. ok...now I get it...first you subtract the pass rate from 1 to get the non pass rate individually. Then multiply them to get the combined no pass rate, then subtract from 1 again to get the combined pass rate?
ganeshie8
  • ganeshie8
thats exactly what we did :)
anonymous
  • anonymous
ALright THank you :)
ganeshie8
  • ganeshie8
np.. :)

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