[填空题]
The delivery time (in mink:8gx9chr gk6kzn0 7l.w t,7b s5ghdputes)l7 fs +euhhh oop(g1.k/3oqd* for a pizza from Pizzeria da Michele follows a normal distribution with a mean of 30 and standard deviation of 5 . On a particls(hho.fqo e31*od7g h/p ku+ular day, 12 \% of the pizzas were delivered 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. ≈
