According to a national survey, 16% of U.S. adults use the Internet to make telephone calls. In a random survey of 100 adults, what is the probability that at most 20 of them use the internet to make telephone calls?

Question

According to a national survey, 16% of U.S. adults use the Internet to make telephone calls.  In a random survey of 100 adults, what is the probability that at most 20 of them use the internet to make telephone calls?

elonasushchik · Answer

Has the cumulative dstribution function been covered in class?

If so, then the answer can be calculated for F(20, 100, 0.16) in which k=20, n=100 and p=0.16.

amistre64 · Answer

this may take a while, what sort of distributions have you covered?  maybe a normal approximation to the binomial?

amistre64 · Answer

and, what sort of tools do you have, ti83 or something?  or just tables