1. Many astores run \"secret sales\": Shoppers receive cardsthat detremine how l

Question

1. Many astores run "secret sales": Shoppers receive cardsthat detremine how large a discount thye get, but the percentage isrevealed by scratching off that black stuff only after the purchasehas been totaled at the cash register. The store is required toreveal( in the fine print) the distrubition of discountsavailable.Determine whether the following probability assignment islegitimate. Probability of 10%   20%    30%  50% 0.05   0.20    0.45  0.20 a. legitimate b. not legitimate 2. The multiplication rule says that P(A and B) = P(A) x P(B).What must be true about events A and B for this rule toapply? a. the events must be disjoint b. the events must be independent c. the events must be mutually exclusive d. two of the above 3. An imaginary poll in April 2005 asked 931 U.S adults whattheir main source of news was: newspapers, television, internet, orradio: Here are the results: Response      Number Newspaper    242 Television       398 Internet         126 Radio            165 Total              931 If we select a person at random from this sample of 931adults, what is the probability that the person responede"Newspapers"? a. 0.242 b. 0.260 c. 0.177 d. 0.135 e. 0.427 1. Many astores run "secret sales": Shoppers receive cardsthat detremine how large a discount thye get, but the percentage isrevealed by scratching off that black stuff only after the purchasehas been totaled at the cash register. The store is required toreveal( in the fine print) the distrubition of discountsavailable.Determine whether the following probability assignment islegitimate. Probability of 10%   20%    30%  50% 0.05   0.20    0.45  0.20 a. legitimate b. not legitimate 2. The multiplication rule says that P(A and B) = P(A) x P(B).What must be true about events A and B for this rule toapply? a. the events must be disjoint b. the events must be independent c. the events must be mutually exclusive d. two of the above 3. An imaginary poll in April 2005 asked 931 U.S adults whattheir main source of news was: newspapers, television, internet, orradio: Here are the results: Response      Number Newspaper    242 Television       398 Internet         126 Radio            165 Total              931 If we select a person at random from this sample of 931adults, what is the probability that the person responede"Newspapers"? a. 0.242 b. 0.260 c. 0.177 d. 0.135 e. 0.427

Explanation / Answer

1)   b. Not Legitimate 2)  b. the events must be independent 3)   b. 0.260 P(newspapers)=numberof newspapers/total                         =242/931                         =0.260

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