What is the frequency for the interval 86–88 in this histogram? 80, 82, 83, 83, 84, 85, 85, 85, 86, 87, 87, 88, 88, 88, 87, 86, 87, 88 A. 2 B. 6 C. 10 D. 12

Arrange these numbers from least to greatest 3/5 5/7 2/9

Awater holding tank measures 105 m long, 50 m wide, and 8 m deep. traces of mercury have been found in the tank, with a concen- tration of 60 mg/l. what is the total mass of mercury in the tank? answer in units of kg.

Peter applied to an accounting firm and a consulting firm. he knows that 30% of similarly qualified applicants receive job offers from the accounting firm, while only 20% of similarly qualified applicants receive job offers from the consulting firm. assume that receiving an offer from one firm is independent of receiving an offer from the other. what is the probability that both firms offer peter a job?