Statistics and Probability

Check attachment for the questions. Please show work so I can understand ? 

Answer

Answers can be viewed only if
  1. The questioner was satisfied and accepted the answer, or
  2. The answer was disputed, but the judge evaluated it as 100% correct.
View the answer
  • The 1st one is very clear. Thank you. What formula was used for the 2nd one? That's the ine I had the most trouble with. Thanks again!

  • And the probability seems wrong as well. Is it not 0.00039? Just trying to understand.

  • The formula for the amount of ways choosing n objects from a set of k objects is nCk (read "n choose k") = n!/((n-k)! * k!). Also, 0.00039 = 0.039%

  • Ok thank you so much for the help!

The answer is accepted.