Some negative binomial help

mfdoom11

New member
Joined
Sep 21, 2019
Messages
5
When you post a picture on social media, it seems like your friends randomly "like" the picture. Independent of the quality or the humor of the photo, there seems to be a 21.2% chance of the picture being "liked" for any given picture.

Let X represent the number of pictures you post until one is "liked." (X represents the photo number that is actually liked.) Find:
μXμX:
Correct
(rounded to 3 decimals)

σXσX:
Correct
(rounded to 3 decimals)

P(X=5)P(X=5):
Correct
(rounded to 4 decimals)

P(X<9)P(X<9):
Incorrect
(rounded to 4 decimals)

P(X>11)P(X>11):
Correct
(rounded to 4 decimals)

P(8≤X≤13)P(8≤X≤13):
Incorrect
(rounded to 4 decimals)
Answer: 4.717
Answer: 4.187
Answer: 0.0817
Answer: 0.8513
Answer: 0.0727
Answer: 0.1435

I want to know how to get the answers for number 4 and 6. can someone show the steps
 
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