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Probability assignments

1. Smith keeps track of poor work. Often on afternoon it is 5%. If he checks 300 of 7500 instruments what is probability he will find less than 20substandard?

2. Realtors estimate that 23% of homes purchased in 2004 were considered investment properties. If a sample of 800 homes sold in 2004 is obtained what is the probability that at most 200 homes are going to be a good investment?

3. Survey 83% of community for a park. Randomly select 21 people if they do or do not want a park. Can you use normal distribution to approximate binomial distribution?If so find mean and SD if not say why.

4. Physical fitness association 1 mile run. It is known to have a normal distribution; mean 450 sec. SD 50 sec. How many in the top 10% fastest runners? Need to know what time they had to beat.

5. Owner of a computer repair shop has daily revenue with mean $7200 and SD $1200 Daily revenue for next 30 days will be monitored. What is probability that daily revenue for those 30 days will be will be between $7500-7000?

 

 

 

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