In triangle lmn, angle n is a right angle, lm = 76, and mn = 40. what is angle m?

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The weights of broilers (commercially raised chickens) are approximately normally distributed with mean 1387 grams and standard deviation 161 grams. what is the probability that a randomly selected broiler weighs more than 1,425 grams?

Plz ( true - false) all triangles have interior angles whose measure sum to 90.