Hamburg -2.5 'c

The temperature in hamburg rises by 1.8 'c
what is the new temperature in hamburg?

Pls! does anybody know a shortcut for answering these types of questions in the future?

Aparticular telephone number is used to receive both voice calls and fax messages. suppose that 25% of the incoming calls involve fax messages, and consider a sample of 25 incoming calls. (a) what is the expected number of calls among the 25 that involve a fax message?

What is the interquartile range of this day at set?