According to an article appearing in the newspaper's almanac, about 70% of all US households have a cell phone. In a city of 255,000, what is the probability that less than 100,000 have a cell phone?
I know about the x-u/o
so 100,000-178,000/
255,000 (.70)
p=.70
q=.30
o= 231.40
i dont know where to go next