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The amount of time travellers at an airport spend with customs officers has a mean of  μ...

The amount of time travellers at an airport spend with customs officers has a mean of  μ =31 μ =31 seconds and a standard deviation of  σ =14 σ =14 seconds. For a random sample of 35 travellers, what is the probability that their mean time spent with customs officers will be:

a) Over 30 seconds?

b) Under 35 seconds?

c) Under 30 seconds or over 35 seconds?

Math   Statistics-And-Probability   
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