An electron has an atomic mass of 5.4 x 10-4. if a carbon atom has 6 electrons, what is the combined atomic mass of the electrons in a single carbon atom? answer in scientific notation.

a) 3.24 x 10-3
b) 3.24 x 10-4
c) 3.24 x 10-5
d) 32.4 x 10-4

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.