The help function invokes Python's built-in help system. If no argument is passed, the function returns a welcome message explaining the use of the function and inviting us to enter the search text. If the argument is a text string, that string is searched for as the name of a module, function, class, method, keyword, or topic in the documentation, and available help is displayed.
The round function rounds a number to a precision given by the number of decimal places specified as an argument. If the number of decimal places is not specified, 0 is taken as the default value.
The returned value is rounded to the nearest multiple of 10 ^ (- number of decimal places). If two multiples are equally close, the even value is taken.
The T.DIST.RT function returns the right-tailed Student's t-distribution.
The T.DIST.2T function returns the two-tailed Student's t-distribution.
The T.DIST function returns the left-tailed Student's t-distribution.
The EXPON.DIST function returns the value of the exponential distribution corresponding to a number.
The COUNTBLANK function counts the number of cells containing Blank values in a column.
The CROSSJOIN function returns a table made up of the Cartesian product of all the rows in all the tables included as arguments.
The NATURALLEFTOUTERJOIN function performs a natural left outer join of two tables.
The NATURALINNERJOIN function performs a natural inner join of two tables.
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