Question

1.The weight of male babies less than 2 months old in the United states is normally distributed with mean 12.5 pounds and standard deviation 5.1 pounds. use the ti 84 calculator to answer the following: round your answers to four decimal places.

a) what proportion of babies weigh more then 14 pounds?

b) what proportion of babies weigh less then 16 pounds?

c) what proportion of babies weigh between 11 and 15 pounds?

d) is it unusual for a baby to weigh more than 17 pounds?

2. in a recent study, the center for disease and control centers reported that dialostic blood pressures of adult women in the united states are approximately distributed with mean 80.5 and standard deviation of 9.9. round your answer to two decimal places.

a) find the third quartile of the blood pressures

3.according to the nelson company, the mean number of tv sets in the us household in 2013 was 2.24. assume the standard deviation 1.3. a sample of 80 households is drawn. round your answers to four decimal places.

a) what is the probability that the sample mean number of tv sets is greater than 2?  

b) what is the probability that the sample mean number of tv sets is between 2.5 and 3?

c) find the 80th percentile of the sample mean.

d) would it be unusual for the sample mean to be less than 2?

it would or would not be unusual because the probability of the sample mean being less than 2 is:

e) do you think it would be unusual for an individual to have fewer than 2 tv sets? yes it would be or no it wouldn't be because the probability that an individual household has fewer than 2 tv sets is:

4. the mean monthly rent for a one bedroom apartment without a doorman in manhattan is $2630. assume that the standard deviation is $500. a real estate firm samples 100 apartments.

a) the probability that the sample mean is greater than $2700 is:

b) the probability that the sample mean rent is between $2450 and $2550 is:

c) the 25th percentile of the sample mean rent is

d) it is usual or unusual because the probability of the sample mean is greater than $2646 is -------

e) would it be unusual for an individual to have rent greater than $2645?

it would be usual or unusual because the probability that the apartment has a rent greater than $2645 is --------.

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Answer 1