I NEED THE EXCEL FORMULAS: To become an actuary, it is necessary to pass a series of 10, including the most important on

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I NEED THE EXCEL FORMULAS:
To become an actuary, it is necessary to pass a series of 10,
including the most important one, an in probability and statistics.
An insurance company wants to estimate the mean score on
this for actuarial students who have enrolled in a special
study program. They take a sample of 8 actuarial students in this
program and determine that their scores are: 2, 5, 8, 8, 7, 6, 5,
and 7. The mean of the sample is ________, while the standard
deviation of the sample is __________.
To become an actuary, it is necessary to pass a series of 10,
including the most important one, anin probability and statistics.
An insurance company wants to estimate the mean score on
this for actuarial students who have enrolled in a special
study program. They take a sample of 8 actuarial students in this
program and determine that their scores are: 2, 5, 8, 8, 7, 6, 5,
and 7. Construct a 90% confidence interval for the mean score of
actuarial students in the special program
A hotel chain wants to estimate the mean number of rooms rented
daily in a given month. The population of rooms rented daily is
assumed to be normally distributed for each month with a standard
deviation of 240 rooms. During February, a sample of 25 days has a
sample mean of 370 rooms. Construct a 99% confidence interval for
the mean number of rooms rented daily in a given month.