Add mean keyword to std/var methods

Author: antonwolfy

dpnp/dpnp_array.py

@@ -1642,6 +1642,7 @@ def std(
         keepdims=False,
         *,
         where=True,
+        mean=None,
     ):
         """
         Returns the standard deviation of the array elements, along given axis.
@@ -1650,7 +1651,9 @@ def std(
 
         """
 
-        return dpnp.std(self, axis, dtype, out, ddof, keepdims, where=where)
+        return dpnp.std(
+            self, axis, dtype, out, ddof, keepdims, where=where, mean=mean
+        )
 
     @property
     def strides(self):
@@ -1849,6 +1852,7 @@ def var(
         keepdims=False,
         *,
         where=True,
+        mean=None,
     ):
         """
         Returns the variance of the array elements, along given axis.
@@ -1857,7 +1861,9 @@ def var(
 
         """
 
-        return dpnp.var(self, axis, dtype, out, ddof, keepdims, where=where)
+        return dpnp.var(
+            self, axis, dtype, out, ddof, keepdims, where=where, mean=mean
+        )
 
 
 # 'view'