fix: add weight parameter to accumulator

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Author: anandkaranubc

lib/node_modules/@stdlib/stats/incr/wmean/examples/index.js

@@ -35,7 +35,7 @@ console.log( '\nValue\tWeight\tWeighted Mean\n' );
 for ( i = 0; i < 100; i++ ) {
 	x = randu() * 100.0;
 	w = randu() * 100.0;
-	mu = accumulator( x );
+	mu = accumulator( x, w );
 	console.log( '%d\t%d\t%d', x.toFixed( 4 ), w.toFixed( 4 ), mu.toFixed( 4 ) );
 }
 console.log( '\nFinal weighted mean: %d\n', accumulator() );