anonymous
  • anonymous
a lab network consisting of 20 computers was attack by a computer virus. this virus enters each computer with probability 0.4 independent of others. find the probability that it enters atleast 10 computers? its answer is 0.2447 but i dont know which distribution i should use ?
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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jamiebookeater
  • jamiebookeater
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cwrw238
  • cwrw238
i think you can use the Binomial Distribution
anonymous
  • anonymous
but i gives 0.1171
cwrw238
  • cwrw238
oh - i'm pretty rusty at this stuff - did you use Binomial tables?

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anonymous
  • anonymous
nope
anonymous
  • anonymous
ok let me see the table
cwrw238
  • cwrw238
i'll see if i can dig mine out
anonymous
  • anonymous
its of no use
anonymous
  • anonymous
the table is giving .8725
cwrw238
  • cwrw238
P(X>=10) = 1 -P(X<=9) = 1 - F(9;20,0.4)
cwrw238
  • cwrw238
i cant find my tables i'm afraid
anonymous
  • anonymous
np
anonymous
  • anonymous
@cwrw238 can you give the half solution i m again confused plz
cwrw238
  • cwrw238
ah - the tables are online P = 1 - 0.755 = 0.245 according to them
anonymous
  • anonymous
actually the thing is that i m noob to probability
cwrw238
  • cwrw238
i used the cumulative binomial table
anonymous
  • anonymous
so thanks alot for your help
cwrw238
  • cwrw238
yw - i'm not great at probability - don;t like it very much
anonymous
  • anonymous
@cwrw238 tell me how i can improve my probability
cwrw238
  • cwrw238
i'm sorry i cant really help you there - i expect one of the legends, senseis or gurus should be able to help
anonymous
  • anonymous
You can use the Standard Model Equation...

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