Each of 150 newly manufactured items is examined and the number of scratches per item is recorded (the items are supposed to be free of scratches), yielding the following data: Number of scratches per item 1 3 4 6. 7 Observed frequency 18 37 42 30 13 7 2 1 Let X be the number of scratches on a randomly chosen item, and assume that X has a Poisson distribution with parameter u. Q: Knowing the E(X) = u for the Poisson random variable X, then E(X) would be: 1 n

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Each of 150 newly manufactured items is examined and the number of scratches per item is recorded (the
items are supposed to be free of scratches), yielding the following data:
Number of
scratches
per item
1
3
4
6.
7
Observed
frequency
18
37
42
30
13
7
2
1
Let X be the number of scratches on a randomly chosen item, and assume that X has a Poisson distribution
with parameter u.
Q: Knowing the E(X)
= µ for the Poisson random variable X, then E(X) would be:
1
n
Transcribed Image Text:Each of 150 newly manufactured items is examined and the number of scratches per item is recorded (the items are supposed to be free of scratches), yielding the following data: Number of scratches per item 1 3 4 6. 7 Observed frequency 18 37 42 30 13 7 2 1 Let X be the number of scratches on a randomly chosen item, and assume that X has a Poisson distribution with parameter u. Q: Knowing the E(X) = µ for the Poisson random variable X, then E(X) would be: 1 n
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