Question 1 In a study conducted for the state Department of Education, 30 percent of the teachers who left teaching did so because they were laid off. Assume that we randomly select 10 teachers who have recently left their profession. Find the probability that exactly 3 of them were laid off. .0090 .2001 .2668 .3000 Question 2 The chief chemist for a major oil and gasoline production company claims that the regular unleaded gasoline produced by the company contains on average 4 ounces of a certain ingredient. The chemist further states that the distribution of this ingredient per gallon of regular unleaded gasoline is normal and has a standard deviation of 1.2 ounces. What is the probability of finding an average in excess of 4.2 ounces of this ingredient from 100 randomly inspected 1-gallon samples of regular unleaded gasoline? .0062 .0753 .4013 .0475
Question 1
In a study conducted for the state Department of Education, 30 percent of the teachers who left teaching did so because they were laid off. Assume that we randomly select 10 teachers who have recently left their profession. Find the
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.0090 |
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.2001 |
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.2668 |
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.3000 |
Question 2
The chief chemist for a major oil and gasoline production company claims that the regular unleaded gasoline produced by the company contains on average 4 ounces of a certain ingredient. The chemist further states that the distribution of this ingredient per gallon of regular unleaded gasoline is normal and has a standard deviation of 1.2 ounces. What is the probability of finding an average in excess of 4.2 ounces of this ingredient from 100 randomly inspected 1-gallon samples of regular unleaded gasoline?
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.0062 |
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.0753 |
||
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.4013 |
||
|
.0475 |
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