CH 4 Binom examples

CH 4 Binom examples - CH 4 I Class examples Consider the...

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CH. 4 Class examples I . Consider the discrete probability distribution when answering the following question. X 1 2 4 6 8 P (x) . 20 ? . 30 . 10 .3 o Find the probability that X is large than 2. o Calculate the mean and variance for this distribution. o Find the probability that X is at most 4. o Find the probability that µ - σ < X < µ + σ. II . Current estimates suggest that only 60% of the home-based computers have access to on-line services. Suppose 20 people with home-based PC were randomly and independently sampled. Find the probability that at least 10 but at most 14 currently have access to on-line services. Find the probability that fewer than quarter of those sampled currently have no access to on-line services. Find the probability that at least 18 currently have access to on-line services. How many people do you expect currently do not have access to on-line services? III. According to a recent study, 1 in every 10 women has been a victim of domestic abuse at some point in their lives. Suppose we have randomly and independently sampled 20 women and asked whether they have been a victim of domestic abuse at some point in their lives. Find the probability that at most 6 of the sampled women have been the victim of domestic abuse at some point in their lives. Find the probability that less than 15 of the sampled women have not been the victim of domestic abuse at some point in their lives. How many of the 20 women do we expect have been the victim of domestic abuse? IV . Current estimates suggest that only 45% of the home-based computers have access to on-line services. Suppose 25 people with home-based computers were randomly and independently sampled. Find the
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CH 4 Binom examples - CH 4 I Class examples Consider the...

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