[填空题]
The delivery time (in y 3wep sw2c, v-++al-rf)f :: rvfzxiuminutes) for a pizza from Pizzeria drv) q2arg e)h8i7httds85+dya Michele follows a normal distribution with a mean of 30 and standard deviation of 5 . On a particular day, 12 it2r 7+h8ras8gy)) h v e5ddqt\% 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. ≈
