probability 8-39, 41 - StudentOfFortune.com

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falcon6
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$1.00 probability 8-39, 41

From Mathematics: Probability , Mathematics: Combinatorics
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Due on May. 17, 2009
Asked on May 14, 2009 at 1:56:48PM

Q:
A certain machine that is used to manufacture
screws produces a defect rate of .01. A random sample of
20 screws is selected. Find the probabilities that the sample contains the following.

39. Exactly 4 defective screws
41. No more than 4 defective screws

ANSWER:
39. .00004
41. 1.0000
i need help with the steps

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b_h

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$1.00 Calculating Probabilities

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Posted on May 14, 2009 at 2:17:37PM

A:
Preview: ... N are defective. The Binomial distribution formula is P(X = k) = (N choose k) * p^k * q^(N-k) Where p is the probability of a defective screw, and q = 1 - p. Here N = 20, and k = 4. So we want P(X = 4) = (20 choose 4) * (0.01)^4 * (0.99)^16 = 4845 * (1 ...

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bogdan
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$0.50 Explained solution

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Posted on May 14, 2009 at 2:30:20PM

A:
Preview: ... stribution. If p is the probability of a success, then the probability of k successes out of n tries is nCk*p^k*( ...

The full tutorial is about 67 words long .