### Question:
AnalyticsUtils { public static Double calculateYearlyWeightedAverage( Double year1Value, Double year2Value, Double factor ) { return Precision.round( (year1Value * ((12 - factor) / 12)) + (year2Value * (factor / 12)), DECIMALS_NO_ROUNDING ); }  static String getDebugDataSql( DataQueryParams params ); static List<DimensionalItemObject> getByDataDimensionItemType( DataDimensionItemType itemType, List<DimensionalItemObject> dataDimensionOptions ); static Number getRoundedValue( DataQueryParams params, Integer decimals, Double value ); static Object getRoundedValueObject( DataQueryParams params, Object value ); static ColumnDataType getColumnType( ValueType valueType, boolean spatialSupport ); static Map<String, T> convertDxToOperand( Map<String, T> valueMap, TotalType totalType ); static Map<String, Double> getDoubleMap( Map<String, Object> map ); static Map<String, Object> getAggregatedDataValueMapping( Grid grid ); static DataValueSet getDataValueSetFromGrid( DataQueryParams params, Grid grid ); static void handleGridForDataValueSet( DataQueryParams params, Grid grid ); static Object getIntegerOrValue( Object value, DimensionalItemObject item ); static Map<String, DimensionalItemObject> getDimensionalItemObjectMap( DataQueryParams params ); static Map<String, String> getDimensionItemNameMap( DataQueryParams params ); static Map<String, MetadataItem> getDimensionMetadataItemMap( DataQueryParams params ); static Map<String, String> getCocNameMap( DataQueryParams params ); static Map<String, String> getUidDisplayPropertyMap( List<QueryItem> queryItems, DisplayProperty displayProperty ); static Map<String, String> getUidDisplayPropertyMap( List<DimensionalObject> dimensions, boolean hierarchyMeta, DisplayProperty displayProperty ); static boolean periodIsOutsideApprovalMaxYears( Integer year, Integer maxYears ); static int getLevelFromOrgUnitDimensionName( String dimensionName ); static boolean isTableLayout( List<String> columns, List<String> rows ); static Double calculateYearlyWeightedAverage( Double year1Value, Double year2Value, Double factor ); static Double getBaseMonth( PeriodType periodType ); static void throwIllegalQueryEx( ErrorCode errorCode, Object... args ); static boolean isPeriodInPeriods( String period, List<DimensionalItemObject> periods ); static List<DimensionalItemObject> findDimensionalItems( String dimensionIdentifier,
        List<DimensionalItemObject> items ); static boolean hasPeriod( List<Object> row, int periodIndex ); static final String ERR_MSG_TABLE_NOT_EXISTING; }### Answer:
@Test public void testCalculateYearlyWeightedAverage() { double avg = AnalyticsUtils.calculateYearlyWeightedAverage( 10D, 20D, 9D ); assertEquals( 17.5, avg, 0 ); avg = AnalyticsUtils.calculateYearlyWeightedAverage( 10D, -20D, 9D ); assertEquals( -12.5, avg, 0); }