Need help for a and c. Here are the question. Thank you!

In post-apocalyptic Neverland, clean water is sold in "2-liter" bottles off the back of a truck that arrives every day. The arrival time is normally distributed with mean 2:54 pm and standard deviation 24 minutes. The time it takes for the water to sell out is also normally distributed with mean 33 minutes and standard deviation 7 minutes. The price of a "2-liter" bottle fluctuates from day to day according to a Normal distribution with mean 128 rubles and standard deviation 4 rubles. The amount of water in a "2-liter" bottle varies from bottle to bottle according to a Normal distribution with mean 63.5 ounces and standard deviation 1 ounce. Assume that all days, all times, and all bottles are independent. a. On April 3, 2020, you buy four "2-liter" bottles of clean water. What is the probability that it costs you more than 500 rubles? Give your answer to 4 decimal places. 0.9332 Submit Answer Incorrect. Tries 1/5 Previous Tries b. On April 3, 2020, you buy four "2-liter" bottles of clean water. What is the probability that you get more than 2 gallons (256 ounces) of clean water? Give your answer to 4 decimal places. 0.1587 Computer's answer now shown above. You are correct. P . T . Your receipt no. is 155-5833 @ w c. On April 3, 2020, you arrive to the lot where the truck stops at exactly 3:00 pm. What is the probability that the water is sold out by the time you arrive? Give your answer to 4 decimal places. 0.0001 Submit Answer Incorrect. Tries 1/5 Previous Tries d. What is the probability that the truck arrives before 3:00 pm on exactly 4 days in one week? Give your answer to 4 significant figures. 0.2906 Computer's answer now shown above. You are correct. Your receipt no. is 155-2317 9 m