please help me with this

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answerhappygod
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please help me with this

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please help me with this
Please Help Me With This 1
Please Help Me With This 1 (20.83 KiB) Viewed 79 times
(5) Let X, X2,..., X100 be a random sample of size 100 from an exponential distribution with mean 20. (a) Find P(18 < X < 23). (b) Find the probability that at least 30 sample points from X1, X3,..., X100 are smaller than 10.
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