Project #13037 - Math Stats

If you can help me with this assignment and get an A I'll pay 50 for A muitple choice test 2

2.) The average annual salary for alll U.S. Teachers is $47,750. Assume that the distribution is normal and the standard deviation is $5680. Find the probability that a randomly selected teacher earns

A) Between 35,000 and 45,000 a year

B.)More than 40,000 a year

C.) IF you were applying for a teaching position and were offered 31,000 a year, how would you feel(based on information)?

 

11.) The average credit card debt for college seniors is $3262. If the debt is normally distributed with a standard deviation of $1100, find these probabilities.

A.) The senior owes at least 1,000

B.) The senior owes more than 4,000

C.) The senior owes between 3,000 and 4,000

12.) Price of gasoline The average retail price of gasoline (all types) for the first half of 2009 was 236.5 cents. What would the standard deviation have to be in order for a 15% probability that a gallon of gas cost less than $2.00

14.) Newborn elephant calves usually weigh between 200 and 250 pounds-- until October 2006, that is. An asian elephant at the Houston (Texas) Zoo gave birth to a male calf weighing in at a whopping 384 pounds! Mack (like the truck) is believed to be the heaviest elephant calf ever born at a facility accreditied by the Association of Zoos and Aquariums. If, indeed, the mean weight for a newborn elephant calves is 225 pounds with a standard deviation of 45 pounds, what is the probability of newborn weighting at least 384 pounds? Assume that the weights of newborn elephants are normally distributed.

18.) The average charitable contribution itiemized per income tax return in Pennsylvania is $792. Suppose that the distribution of contributions is normal with the standard deviation of $103. Find the limits for the middle 50% of contributions

30.) To qualify for a police academy, applicants are given a test of physical fitness. The scores are normally distirbuted with a mean of 64 and a standard deviation of 9. If only the top 20% of the applicants are selected, find the cutoff score

36.) In a normal distribution find u when o is 6 and 3.75% of the area lies to the left of 85

22.) Assume that the mean systolic blood pressure of normal adults is 120 millimeters of mercury (mm Hg) and the standard deviation is 5.6 Assume the variable is normally distributed.

A. If an individual is selected, find the probability that the individual's pressure will be between 120 and 121.8mm Hg

B. If a sample of 30 adults is randomly selected, find the probabiltiy that the sample mean will be between 120 and 121.8mm Hg

C. Why is the answer to part a so much smaller than the answer to part b ?

 

 

 

 

Subject Mathematics
Due By (Pacific Time) 09/23/2013 12:00 am
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