Let X be the random variablenumber of cell phone only users.

X ~ Binomial(n = 750, p = 0.07)

Pr(X > 60) = .......

Nowadays technology spits the answer out: 0.1581, correct to four decimal places.

The normal approximation to the binomial distribution could once upon a time be used. You should try using it. Compare to the answer above. How different is it?