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Movie trailers are designed to entice audiences by showing scenes from coming attractions. Several trailers are usually shown in a theatre before the start of

Movie trailers are designed to entice audiences by showing scenes from coming attractions. Several trailers are usually shown in a theatre before the start of the main feature, and most are available via the Internet. The duration of a movie trailer is approximately Normal, with mean 150 seconds and standard deviation 30 seconds

d)In a sample of 16 randomly selected movie trailers, find the probability that the sample mean duration is greater than 4 minutes and 30 seconds.

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