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sjboy (beetle) 于 (Sun Mar 1 16:58:30 2009) 提到:
hi, would like someone help on this problem.
A charity receives 2025 contributions. Contributions are assumed to be
independent and identically distribute with mean 3125 and standard deviation
250. Calculate the approximate 90th percentile for the distributio of the
total contributions received.
(A) 6,328,000
(B) 6,338,000
(C) 6,343,000
(D) 6,784,000
(E) 6,977,000
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