Question 4 (2.14 points) Listen The average completion time for one piece is 4.8 minutes with a standard deviation of 0.6 minutes. If completion times follow a normal distribution, how many minutes should it take to complete a piece in order to be in the lower 15% of the completion times distribution? in the upper 25% of the completion times distribution? Ox s 4.18 min (lower 15%) . x > 5.20 min (upper 25%) x 2 4.18 min (lower 15%) . x 3 5.20 min (upper 25%) x 2 4.69 min (lower 15%) . x $ 4,86 min (upper 25%) x 5 4.69 min (lower 15%). x > 4.86 min (upper 25%)