Consider the probability that at least 84 out of 273 students will not graduate on time. Choose the best description of the area under the normal curve that would be used to approximate binomial probability.

Serena is making an experiment. for that, she needs 20 grams of a 52% solution of salt. she has two large bottles of salt water: one with 40% and the other with 70% of salt in them. how much of each must she use to make the solution she needs? i am in need of