bench: update c benchmarks

---
type: pre_commit_static_analysis_report
description: Results of running static analysis checks when committing changes.
report:
  - task: lint_filenames
    status: passed
  - task: lint_editorconfig
    status: passed
  - task: lint_markdown
    status: na
  - task: lint_package_json
    status: na
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    status: na
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    status: na
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    status: na
  - task: lint_javascript_tests
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  - task: lint_javascript_benchmarks
    status: na
  - task: lint_python
    status: na
  - task: lint_r
    status: na
  - task: lint_c_src
    status: na
  - task: lint_c_examples
    status: na
  - task: lint_c_benchmarks
    status: missing_dependencies
  - task: lint_c_tests_fixtures
    status: na
  - task: lint_shell
    status: na
  - task: lint_typescript_declarations
    status: na
  - task: lint_typescript_tests
    status: na
  - task: lint_license_headers
    status: passed
---

Author: gururaj1512

lib/node_modules/@stdlib/stats/base/sdsnanmean/benchmark/c/benchmark.length.c

@@ -102,10 +102,10 @@ static double benchmark1( int iterations, int len ) {
 	int i;
 
 	for ( i = 0; i < len; i++ ) {
-		if ( rand_double() < 0.2 ) {
-			x[ i ] = 0.0 / 0.0; // NaN
+		if ( rand_float() < 0.2 ) {
+			x[ i ] = 0.0f / 0.0f; // NaN
 		} else {
-			x[ i ] = ( rand_double() * 20000.0 ) - 10000.0;
+			x[ i ] = ( rand_float() * 20000.0f ) - 10000.0f;
 		}
 	}
 	v = 0.0f;
@@ -140,10 +140,10 @@ static double benchmark2( int iterations, int len ) {
 	int i;
 
 	for ( i = 0; i < len; i++ ) {
-		if ( rand_double() < 0.2 ) {
-			x[ i ] = 0.0 / 0.0; // NaN
+		if ( rand_float() < 0.2 ) {
+			x[ i ] = 0.0f / 0.0f; // NaN
 		} else {
-			x[ i ] = ( rand_double() * 20000.0 ) - 10000.0;
+			x[ i ] = ( rand_float() * 20000.0f ) - 10000.0f;
 		}
 	}
 	v = 0.0f;