Calculate the binomial distribution for
n = 14 e p = 0,60, find P(X < 9)
P(X < 9) = 1 - P(X > 9) ????
No, P(X < 9) means all the values of X that X can take that is less than nine, excluding 9. This means you have X = 0, 1, 2, 3, 4, 5, 6, 7, 8.
But for P(X > 9), you have X = 10, 11, 12, 13, 14.
But 1 - P(X > 9) incluse the values of X = 0, 1, 2, 3, 4, 5, 6, 7, 8, 9.
which is not equal to P(X < 9)