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1 .suppose that family incomes in a town or normally distributed with a meeting of $1,120 and a standard Deviation of $ 600 per month. What is the probability that a given family has an income over $ 2000 per month ?

2 . During the last week of the semester , students at a certain college spends on the average 4.2 hours using the school's computer terminals with a standard deviation of 1.8 hours for a random sampling of 36 students at that collage , find the average time spent using the compute terminal during the last week of the semester

a, at least 4.8 hours

b,  between 4.1 and 4.5 hours

Statistics and Probability, Statistics

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