Hello.

So you ask about two different probabilities. first: exact 35 orders; second: exact 50 orders

the probability "exact 35 orders" is according to the binomial distribution

p(exact 50 orders) =

Edit:

OH yea, actually it is "between 35 and 50". I didn't read the word "between". That makes a big difference. Thanks to mr fantastic

In that case you have to sum the probabilities like this

Sorry for the mistake.

Regards

Rapha