SOLUTION: Out of 100 jobs vacant at some software company, 30 jobs are class I and 70 jobs are class II. Sample of 30 jobs are taken, then find the probability that a) There will be exactl

Question 507142: Out of 100 jobs vacant at some software company, 30 jobs are class I and 70 jobs are class II. Sample of 30 jobs are taken, then find the probability that
a) There will be exactly 12 jobs of class I
b) At the most 2 jobs on class II

Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
Out of 100 jobs vacant at some software company, 30 jobs are class I and 70 jobs are class II. Sample of 30 jobs are taken, then find the probability that
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Binomial Probme with n = 100 and p(Class I) = 0.3 and p(Class II) = 0.7
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a) There will be exactly 12 jobs of class I
P(x = 12) = 100C12*(0.3)^12*(0.7)^88 = 0.000013045
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b) At the most 2 jobs on class II
Using a TI-84 calculator I get:
P(0<= x <=2) = binomcdf(100,0.7,2) = 1.40x10^-48
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Cheers,
Stan H.
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