correct a pair of issues in the method examples on outcome creation ui
correct a pair of issues in the method examples on outcome creation ui

fixes CNVS-19447

patch corrects math error on decaying_average example and adds the
mastery score being used in the n_mastery example in outcome creation ui

Change-Id: Ie7158906af69a563a23e98c43a4680c478a66129
Reviewed-on: https://gerrit.instructure.com/50787
Reviewed-by: Simon Williams <088e16a1019277b15d58faf0541e11910eb756f6@instructure.com>
Product-Review: Simon Williams <088e16a1019277b15d58faf0541e11910eb756f6@instructure.com>
QA-Review: Simon Williams <088e16a1019277b15d58faf0541e11910eb756f6@instructure.com>
Tested-by: Jenkins

roxolan/canvas-lms,leftplusrightllc/canvas-lms,sfu/canvas-lms,greyhwndz/canvas-lms,AndranikMarkosyan/lms,wrdsb/canvas-lms,shidao-fm/canvas-lms,wrdsb/canvas-lms,instructure/canvas-lms,wrdsb/canvas-lms,roxolan/canvas-lms,venturehive/canvas-lms,antoniuslin/canvas-lms,matematikk-mooc/canvas-lms,narigone/canvas,Jyaasa/canvas-lms,dgynn/canvas-lms,grahamb/canvas-lms,instructure/canvas-lms,instructure/canvas-lms,tgroshon/canvas-lms,sfu/canvas-lms,HotChalk/canvas-lms,sdeleon28/canvas-lms,leftplusrightllc/canvas-lms,djbender/canvas-lms,eCNAP/CANVAS,matematikk-mooc/canvas-lms,matematikk-mooc/canvas-lms,venturehive/canvas-lms,djbender/canvas-lms,utkarshx/canvas-lms,AndranikMarkosyan/lms,juoni/canvas-lms,kyroskoh/canvas-lms,juoni/canvas-lms,narigone/canvas,roxolan/canvas-lms,Rvor/canvas-lms,instructure/canvas-lms,leftplusrightllc/canvas-lms,dgynn/canvas-lms,shidao-fm/canvas-lms,SwinburneOnline/canvas-lms,Jyaasa/canvas-lms,va7map/canvas-lms,venturehive/canvas-lms,HotChalk/canvas-lms,shidao-fm/canvas-lms,jay3126/canvas-lms,SwinburneOnline/canvas-lms,kyroskoh/canvas-lms,ShreniiNepal/shrenii_lmp,jay3126/canvas-lms,snehakachroo1/LSI_replica,dgynn/canvas-lms,fronteerio/canvas-lms,eCNAP/CANVAS,grahamb/canvas-lms,Rvor/canvas-lms,tgroshon/canvas-lms,grahamb/canvas-lms,fronteerio/canvas-lms,djbender/canvas-lms,grahamb/canvas-lms,sfu/canvas-lms,sdeleon28/canvas-lms,greyhwndz/canvas-lms,eCNAP/CANVAS,skmezanul/canvas-lms,eCNAP/CANVAS,ShreniiNepal/shrenii_lmp,Jyaasa/canvas-lms,redconfetti/canvas-lms,shidao-fm/canvas-lms,roxolan/canvas-lms,redconfetti/canvas-lms,sfu/canvas-lms,jay3126/canvas-lms,whalejasmine/canvas-lms,fronteerio/canvas-lms,whalejasmine/canvas-lms,juoni/canvas-lms,grahamb/canvas-lms,sfu/canvas-lms,redconfetti/canvas-lms,tgroshon/canvas-lms,fronteerio/canvas-lms,leftplusrightllc/canvas-lms,kyroskoh/canvas-lms,juoni/canvas-lms,utkarshx/canvas-lms,va7map/canvas-lms,SwinburneOnline/canvas-lms,redconfetti/canvas-lms,va7map/canvas-lms,HotChalk/canvas-lms,dgynn/canvas-lms,HotChalk/canvas-lms,antoniuslin/canvas-lms,wrdsb/canvas-lms,Rvor/canvas-lms,sdeleon28/canvas-lms,utkarshx/canvas-lms,snehakachroo1/LSI_replica,efrj/canvas-lms,jay3126/canvas-lms,skmezanul/canvas-lms,skmezanul/canvas-lms,Jyaasa/canvas-lms,snehakachroo1/LSI_replica,djbender/canvas-lms,skmezanul/canvas-lms,snehakachroo1/LSI_replica,narigone/canvas,kyroskoh/canvas-lms,Rvor/canvas-lms,ShreniiNepal/shrenii_lmp,matematikk-mooc/canvas-lms,SwinburneOnline/canvas-lms,AndranikMarkosyan/lms,venturehive/canvas-lms,antoniuslin/canvas-lms,efrj/canvas-lms,whalejasmine/canvas-lms,ShreniiNepal/shrenii_lmp,instructure/canvas-lms,instructure/canvas-lms,narigone/canvas,tgroshon/canvas-lms,va7map/canvas-lms,sfu/canvas-lms,efrj/canvas-lms,whalejasmine/canvas-lms,sdeleon28/canvas-lms,utkarshx/canvas-lms,greyhwndz/canvas-lms,AndranikMarkosyan/lms,sfu/canvas-lms,efrj/canvas-lms,antoniuslin/canvas-lms,greyhwndz/canvas-lms,instructure/canvas-lms