Business Statistics

174 Business Statistics

1. Let the probability that the household has computers with Internet access or two or more

computers be P(E

1

or E

2

). From the additional rule of probability

1 2 1 2 1 2

( or ) ( ) ( ) ( and )P E E P E P E P E E= + −

After placing the values,

1 2

( or ) 0.6 0.7 0.5 0.8P E E = + − =

Therefore, the probability that a household has computers with Internet access or two or more

computers is 0.8.

2. Probability that the household has computers with Internet access or two or more computer sets

but not both.

P(Probability that the household has computers with Internet access or two or more compute