Large samples so everything is normal Big apples have weight

Large samples, so everything is normal. \"Big\" apples have weight approximately normally distributed with mean 1G0 grams and standard deviation 15. \"Large\" apples have weight approximately normally distributed with mean 170 grams and standard deviation 20. Pick one of each type of apple, independently. Find the probability that the two apples together weigh more than 350 grams. Explain. Find the probability that the \"big\" apple weighs more than the \"large\" one. Explain.

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