in a city located by the equator, the average yearly temperature...

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# in a city located by the equator, the average yearly temperature...

1. in a city located by the equator, the average yearly temperature will exceed 100 degrees Fahrenheit 62% of the time. what is the probability that for the past 50 years, the temperature has exceeded 100 degrees at most 57% of the time.
2. a 2014 study of 300 randomly selected residents of a city found that 7% of them had been exposed to the mosquito born virus that causes dengue fever. suppose the actual percentage of people in the city who have been exposed to the virus is 6%. the researcher of the study believe the discrepancy is due to the sample size, so they decided to conduct another survey with double the sample size. what is the probability that the proportion of residents from this new survey that has been exposed to the virus will be even higher than the previous study?
3. it is known that 80% of former students in Mr. Tsai's classes regularly celebrate An-Tsai commercialism day every year. suppose we want to determine the probability that from a random sample chosen of former students, less than 75% celebrate An-Tsai commercialism day. what is the smallest sample size necessary to fulfill the criteria of normality before solving the problem using sampling distributions?

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