Question

I am not sure what I am not grasping. I can calculate the exact number but...

I am not sure what I am not grasping. I can calculate the exact number but not fewer than or at least.
the question I am working on is "According to an airline, flights on a certain route are on time 75% of the time. Suppose 20 flights are randomly selected and the number of on-time flights is recorded.
(c) is find the probability that exactly 13 lights are on time.
I found this to be 0.1124 rounded to 4 places.
(d) find the probability that fewer than 13 flights are on time.
I found to be 0.1018
(e) find the probability that at least 13 flights are on time.
(f) find the probability that between 11 and 13 flights, inclusive, are on time.

I got 0.993031 for (e) but it said it was wrong

Math   Statistics-And-Probability   
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