Scenario:

• https://www.mongodb.org: link to download
• Official download page for stable/production linux version: https://www.mongodb.org/downloads#production
• link to "Installation Instructions" lead to https://docs.mongodb.org/master/tutorial/install-mongodb-on-linux/
• link to install on RedHat: https://docs.mongodb.org/master/tutorial/install-mongodb-on-red-hat/

There, the documented rpm repo is for 3.2 instead of 3.0:

For the latest stable release of MongoDB
Use the following repository file:

[mongodb-org-3.2]
name=MongoDB Repository
baseurl=https://repo.mongodb.org/yum/redhat/$releasever/mongodb-org/3.2/x86_64/
gpgcheck=0
enabled=1

This is false: 3.2 is not stable yet.

For ubuntu it's still the 3.0 repo:
https://docs.mongodb.org/master/tutorial/install-mongodb-on-ubuntu/

The whole manual is for the upcoming 3.2 version, so either the default documentation should not be the master/ version, or the ubuntu page is not up to date.