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It is reported that 21% of American households use a cell phone exclusively for their telephone service. In a sample of eight households, find the probability that:
a. No household uses a cell phone as their exclusive telephone service. (Round your answer to 4 decimal places.)
b. Exactly 2 households exclusively use a cell phone for telephone service. (Round your answer to 4 decimal places.)
c. Find the mean number of households exclusively using cell phones. (Round your answer to 4 decimal places.)
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a financial planning service offers a university savings program. the plan calls for you to make six annual payments of
Assume gasoline prices for a region are normally distributed. do the data you obtain provide enough evidence to reject the claim? use 1% level of significance.
Express your answer as a fraction in lowest terms.
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Cities today have to do more with fewer resources, and their police departments are no exception. For example, since 2001 the Santa Cruz Police Department (SCPD) of Santa Cruz, California, has had to lay off 10 of its 104 police officers, while th..
Probability using Z-score.Find the probabilities that a random variable Z having a standard normal distribution will take on a value.
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