Pandemic-fueled challenges forced consumers to wait significantly longer in drive-thru lanes. QSR magazine studied drive-thru times for 10 fast-food restaurants the lengths of time customers would spend in the drive-thru lane - and found that KFC in 2020, had the shortest mean time with a mean time spent in the drive-through lane of 283.3 seconds. Assuming drive-through times are Normally distributed with a standard deviation of 33 seconds, answer the following.

a. What percentage of drive-through times at KFC will last more than 300 seconds?

b. The longest 10% of drive-through times are longer than how many seconds? round top the nearest second.

c. If we select a customer in the drive-through lane at KFC at random, what is the probability that their drive-through time is between 275 and 290 seconds?

d. Dring Lunchtime, it is estimated that 230 customers go through the drive-thru, how many customers have to wait for less than 305 seconds.