PLSSS HELP We know the current is changing over time. Which of these 2 sentences do you think is true? Explain your answer.

A) At a certain frequency, the current is repeatably switching on/off causing the needle on the compass to move.

B) At a certain frequency, the current is repeatably doing something else that causes the needle on the compass to move.

An office supply company conducted a survey before marketing a new paper shredder designed for home use. in the survey, 80 % of the people who tried the shredder were satisfied with it. because of this high satisfaction rate, the company decided to market the new shredder. assume that 80 % of all people are satisfied with this shredder. during a certain month, 100 customers bought this shredder. find the probability that of these 100 customers, the number who are satisfied is 69 or fewer.