Returns the righttailed probability of the chisquared distribution.
The χ2 distribution is associated with a χ2 test. Use the χ2 test to compare observed and expected values. For example, a genetic experiment might hypothesize that the next generation of plants will exhibit a certain set of colors. By comparing the observed results with the expected ones, you can decide whether your original hypothesis is valid.
Syntax
CHISQ.DIST.RT(x,deg_freedom)
The CHISQ.DIST.RT function syntax has the following arguments:

X Required. The value at which you want to evaluate the distribution.

Deg_freedom Required. The number of degrees of freedom.
Remarks

If either argument is nonnumeric, CHISQ.DIST.RT function returns the #VALUE! error value.

If any argument is nonnumeric, CHISQ.DIST.RT function returns the #VALUE! error value.

If deg_freedom is not an integer, it is truncated.

If deg_freedom < 1 or deg_freedom > 10^10, CHISQ.DIST.RT returns the #NUM! error value.
Example
Copy the example data in the following table, and paste it in cell A1 of a new Excel worksheet. For formulas to show results, select them, press F2, and then press Enter. If you need to, you can adjust the column widths to see all the data.
Data 
Description 

18.307 
Value at which you want to evaluate the distribution 

10 
Degrees of freedom 

Formula 
Description 
Result 
=CHISQ.DIST.RT(A2,A3) 
Onetailed probability of the chisquared distribution, for the arguments specified in A2 and A3. 
0.0500006 