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 }.
The mean score of a college entrance test is 500; the standard deviation is 75. The scores are normally distributed. What percent of the students scored below 320?
Samples of 10 seats of each type (A, B, C) were selected and given the safety test. The scores are given below. Is one seat safer than another or are they all about equal in terms of safety? A. Write a statistical null and alternate hypothesis
At a local middle school, 60% of students are enrolled in choir or band. If a random sample of 5 students is taken, what is the probability that all 5 students are in choir or band?
Kline Company, an accrual basis calendar year corporation, reported $560,000 net income before tax on its financial statements prepared in accordance with GAAP for 2012. Kline%u2019s records reveal the following information.
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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