[填空题]
The delivery time (in mi 1.(u-x+pc*b-qgd nbtid-juwnutes) for a p ;9ndb0 f+7:rd4.gvxilk4w q9x: l ub3gnfqnv izza from Pizzeria da Michele follows a normal distribution with a mean of 30 and standard deviation of 5 . On a particular day, 12 \% of the pizzas were de0gk+vlwn9 q qdu4 bn;v:r7: .fxnilbg43 fxd 9livered 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. ≈
