Merge branch '18-quiz-list-add-average-number-of-attempts-frontend' into 'master'

Resolve "Quiz List add average number of attempts FRONTEND"

Closes #18

See merge request !13
2 jobs for master in 3 minutes and 10 seconds (queued for 3 minutes and 55 seconds)
Status Name Job ID Coverage
  Test
passed unit-test #5464

00:01:24

 
  Build
passed build-all #5465

00:01:46