text: /**
  * @license Apache-2.0
  *
  * Copyright (c) 2018 The Stdlib Authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
  *
  *    http://www.apache.org/licenses/LICENSE-2.0
  *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
  
  'use strict';
  
  // MAIN //
  
  /**
  * Returns the expected value of an arcsine distribution.
  *
  * @param {number} a - minimum support
  * @param {number} b - maximum support
  * @returns {number} expected value
  *
  * @example
  * var v = mean( 0.0, 1.0 );
  * // returns 0.5
  *
  * @example
  * var v = mean( 4.0, 12.0 );
  * // returns 8.0
  *
  * @example
  * var v = mean( -4.0, 4.0 );
  * // returns 0.0
  *
  * @example
  * var v = mean( 1.0, -0.1 );
  * // returns NaN
  *
  * @example
  * var v = mean( 2.0, NaN );
  * // returns NaN
  *
  * @example
  * var v = mean( NaN, 2.0 );
  * // returns NaN
  */
  function mean( a, b ) {
  	if (
  		a >= b
  	) {
  		return NaN;
  	}
  	return 0.5 * ( a + b );
  }
  
  
  // EXPORTS //
  
  module.exports = mean;
  