[商管] 統計問題??
1. If x1, x2, x3 are three normally and independently distributed random
variables with means 7, 28, 6, and variances 4, 12, 4, respectively.
Suppose y = 2x1 + x2 + 3x3
(a) Find the distribution of y and its parameters.
(b) If a random sample of size 150 taken from the distribution of y, find
the probability of sample mean (X-Bar)lies between 59 and 61.
(c) Find the probability of sample mean (X-Bar) exceeds 62
有人可以提供意見嗎!!
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