A company gives each worker a cash bonus every Friday, randomly giving a worker an amount with these probabilities: $10 0.9, $50 0.1. Over many weeks, what is a worker's expected weekly bonus?
( i already have my answer but i wasn't sure if it was right or not)

(10 + 50) / 2 = $30

10×0.9 + 50×0.1 = $14

(10×0.9 + 50×0.1) / 2 = $7

(10 + 50) / 10 = $6