Garde 11 Statistics and Probability Assessment

 

The average weight of a newborn is 7.5 pounds, with a standard deviation of 1.25 pounds. Birth weight follows the standard normal curve. What percent of newborns weigh 5 pounds or less at birth?

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CCSS.HSS.ID.A.4

The amount of fuel used by jumbo jets to take off is normally distributed with a mean of 4000 gallons and a standard deviation of 125 gallons.  What is the probability that the mean number of gallons of fuel needed to take off for a randomly selected sample of 40 jumbo jets will be less than 3950 gallons?

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CCSS.HSS.ID.A.4

A group of 625 students has a mean age of 15.8 years with a standard deviation of 0.6 years.  The ages are normally distributed. What is the probability that a randomly selected student is older than 16.5 years old?

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CCSS.HSS.ID.A.4

A national achievement test is administered annually to 11th HS students. The test has a mean score of 100 and a standard deviation of 15. If Jane's z-score is 1.20, what was her score on the test?

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CCSS.HSS.ID.A.4

The scores of a random sample of 100 high school students on a standardized mathematics test in school A gave a mean of 78 and a standard deviation of 20.

Find the 95% confidence interval estimate for the true average score in mathematics in this standardized test.

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CCSS.HSS.IC.B.4

The number of motorcycles sold annually by salespeople is normally distributed with a standard deviation of 15. A random sample of 300 salespeople was taken and the mean number of motorcycles sold annually was found to be 75. Find the 99% confidence interval estimate of the population mean.(Round your answers to the nearest thousandths)

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CCSS.HSS.IC.B.4

 

An independent group of researchers wants to estimate the daily household expenses on food. They want a 90% confidence level and P1,800 margin of error. How many households must be randomly selected if in the previous survey the standard deviation is P5,600?

Tags

CCSS.HSS.IC.B.4

In a poll of 820 likely voters, 550 say that Philippines spend too little on education. Find the 90% confidence interval of the true proportion of voters who feel this way.

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CCSS.HSS.IC.B.4