On Saturday, Emily's mother gave birth to twins and named them Nyra and Ishaan. When they were first born, Nyra weighted 3.96 kilograms , and Ishaan weighed
2.56 kilograms. How much did the babies weigh in total? ​

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.