Proportion of the total area under the normal curve
What is the proportion of the total area under the normal curve within plus and minus two standard deviations of the mean?
A) 68%
B) 99.7%
C) 34%
D) 95%
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Suppose X~N(0,1)and Y ~N(2,2),(that is ,EY =2 and Var(Y)=2) and X and Y are independently distributed. Find P{X is less than or equals to Y }.
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The mean of a normally distributed group of weekly incomes of a large group of executives is $1,000 and the standard deviation is $100. What is the z-score for an income of $1,100?
What is the probability that 4 randomly selected adult americans have not visited a casino in the past 12 months?
In 2010, Aaron pays $3,000 to become a charter member of Western University's Athletic Council. The membership ensures that Aaron will receive choice seating at all of Western's home football games.
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