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QNT 275 Week 3 Practice: Connect Knowledge Check
1.
A plant manager knows that the number of boxes of supplies received weekly is normally distributed with a mean of 200 and a standard deviation of 20. What percentage of the time will fewer than 160 boxes of supplies arrive in a week?
2.28%
4.56%
42.07%
57.93%
P(x < 160) = P(z < (160 − 200)/20) = P(z < −2) = 0.0228
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2.
The z value tells us the number of standard deviations that a value x is from the mean.
True
False
3.
An event is a collection of sample space outcomes.
True
False
4.
Determine whether these two events are mutually exclusive: consumer with an unlisted phone number and a consumer who does not drive.
not mutually exclusive
mutually exclusive
