Hi
Binomial distribution:  p(success) = .70  and q = .3 (missing)
4 trials
Using TI or similarly an inexpensive calculator like a Casio fx-115 ES plus
probability that he will miss at least one of them? 
Demonstrates must read problem carefully.
probability that he will miss at least one of them: 
Using .3 as probability of missing:
P( x ≥ 1) = 1 - P(x = 0) = 1 - binompdf(4, .3, 0) = 1 - .2401 = .7599
Or
Using .7 as probability of making:
 
 1 - P(x=4) = 1-.2401 = .7599
Wish You the Best in your Studies.