Long Flight Airlines wants to forecast the mean number of unoccupied seats per flight toJapan next year.

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Long Flight Airlines wants to forecast the mean number of unoccupied seats per flight toJapan next year. To develop this forecast, the records of 49 flights are randomly selectedfrom the files for the past year, and the number of unoccupied seats is noted for eachflight. The sample mean and standard deviation are 8.1 seats and 5.7 seats, respectively.Develop a point and 90% interval estimate of the mean number of unoccupied seats perflight during the past year.

a. What is the point estimate?

b. What is the interval estimate?