HELP STATISTICS!!!! PLEASE?

Answers:2   |   LastUpdateAt:2019-01-02 18:25:02  

Question
kdshakjah
Asked at 2012-07-29 11:38:58
1 . ) 19) Suppose that the average price of new cars in 2012 has an average of $ 30,100 and a standard deviation of $ 5,600 . Based on this information, what price range we expect that at least 89% of new car prices that are within ?
a . $ 24,500 to $ 35,700
b. $ 18,900 to $ 41,300
c . $ 13,300 to $ 46,900
d. $ 7,700 to $ 52,500

2 . ) Use the normal approximation to the binomial . In a particular store , there is a probability of 0.03 that the price of scanning the barcode scanner will not match the advertised price. The cashier scans 800 articles. What is the probability of at least 20 mismatches ?
a . 0.6430
b. 0.7184
c . 0.8006
d. 0.8238

3) Between 2 pm and 4 pm on Wednesday, queries sure patients get to Blue Choice insurance at an average rate of 2.2 calls per minute. What is the probability of waiting more than 30 seconds for the next call ? Assume Poisson arrivals .
a . 0.2033
b. 0.3329
c . 0.7967
d. 0

4) In Santa Teresa , the time between false alarms received at the central fire station is 3.33 days. What is the probability that more than 7 days will pass before the false alarm that comes next? Suppose that the time is exponentially distributed .
a . 0.8778
b. 0.6214
c . 0.1222
d. 0.3786

5) 47 ) In the winter , demand for Jonathan apples is 353,000 cases, with a standard deviation of 4,120 cases (assuming normal distribution). What is the probability that demand in a given winter is between 345,000 and 355,000 cases?
a . 0.5732
b. 0.8829
c . 0.6617
d. 0.2382
Answer1 Answered at 2019-01-02 18:25:02

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Answer2chenchaoAnswered at 2018-11-01 22:02:15

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