[填空题]
The delivery time (in minutes) for a pizza from g*lia *bl8 e3/ bvd.jnPizzeria da Michele fon; +pl*-jtd75qbpfh gllows a normal distribution with a mean of 30 and standard deviation of 5 . On a particular day, 12 \% of the pizzas were dbq ptjn5 ;f*-gl d+hp7elivered in more than k minutes.
1. Find the value of k .
As an advertising campaign, Pizzeria da Michele is offering customers a free pizza coupon if their pizza is not delivered in 37.5 minutes or less. ≈ min
2. Find the probability that a randomly chosen customer will get a free pizza coupon. ≈
3. Given that Vito gets a free pizza coupon from Pizzeria da Michele, find the probability that his pizza was delivered in 40 minutes or more. ≈
