1. On a standard test the mean of the grade is 74 and thestandard deviation is 4
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1. On a standard test the mean of the grade is 74 and thestandard deviation is 4. Trevor who got a z-score of -1.58 wouldlike to know his grade on the test. What grade did Trevor get onthe test. Round the answer to the nearest integer. 2.The average has mileage of a certain model car is 33 milesper gallon. If the gas mileages are normally distributed with astandard deviation of 1.4, find the probability that a car has agas mileage of between 30.7 and 35.4 miles per gallon. Round theanswer to the nearest hundredth as a decimal number. 3.A recent study found that the average life expectancy of aperson living in Africa is 53 years with a standard deviation of7.5 years. If a person in Africa is selected at random, what is theprobability that the person will dies before the age of 38. Expressyour answer in percentage. Round answer to the nearest tenth. 1. On a standard test the mean of the grade is 74 and thestandard deviation is 4. Trevor who got a z-score of -1.58 wouldlike to know his grade on the test. What grade did Trevor get onthe test. Round the answer to the nearest integer. 2.The average has mileage of a certain model car is 33 milesper gallon. If the gas mileages are normally distributed with astandard deviation of 1.4, find the probability that a car has agas mileage of between 30.7 and 35.4 miles per gallon. Round theanswer to the nearest hundredth as a decimal number. 3.A recent study found that the average life expectancy of aperson living in Africa is 53 years with a standard deviation of7.5 years. If a person in Africa is selected at random, what is theprobability that the person will dies before the age of 38. Expressyour answer in percentage. Round answer to the nearest tenth.Explanation / Answer
33-30.7=2.3 2.3/1.4=1.64 score 33-35.4=-2.4=1.64 z score SO 90%
53-38=15 15/7.5=2 z score so 2.3% 33-30.7=2.3 2.3/1.4=1.64 score 33-35.4=-2.4=1.64 z score SO 90%
53-38=15 15/7.5=2 z score so 2.3%
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