Hi, actually I have 2 more tests and they seem very very hard, sorry for my sickness. Because I really don't know how to solve them , but if you help me again i will be very thankfull for it!
If you can solve at least one of them , please save my life!
There are questions:

1.
On average at a certain road junction there are 3 accidents per month. An accident may include any number of vehicles and is an independent event, so a vehicle that skids on oil discharged onto the road from an earlier accident is still attributed to that accident.
if we take a month as defined as exactly 30 days, what is the probability of there being 2 or more accidents on any day?
answers :
It is not possible to answer this question
0.0047
0.8008
0.0
4.95025E-05

2.
An oil terminal can handle 10 tankers on any day and on average receives 7 per day. What are the expected number of days in a 365 day year that there will be too many tankers arriving for the terminal to deal with?
answers:
0.012
32
36
19
0.071

3.
On average a machine breaks down 1.5 times in any year what is the standard deviation of the number of breakdowns in a year?

no answers:(

Please, with solutions